>第 5 章 深入理解函数>return语句>习题

djxhero djxherohe@gmail.com
2002-02-24 09:14:09

double myround(double x){
        double y = x * 10.0;
        int m =((int) y) % 10;
        if(m>4){
                return ceil(x);
        }else{
                return floor(x);
        }
}

看了大家的解法,知道我的解法绕路了。哈哈,还是贴出来吧


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double myround(double x)
  5 {
  6         if (0.0 == x) {
  7                 return 0.0;
  8         }
  9 
 10         double temp = ceil(x);
 11         double judge = temp - x;
 12 
 13         if (judge >= 0.5) {
 14                 return floor(x);
 15         }
 16         else {
 17                 return ceil(x);
 18         }
 19 }


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#include <stdio.h>
#include <math.h>

int is_leap_year(int);
double myround(double);

int main(void)
{
    printf("is leap year:%d\n",is_leap_year(2000));
    printf("%.2f:%.2f",myround(-3.33),myround(43.20));
    return 0;
}

int is_leap_year(int year)
{
    return (year%4==0&&year%100!=0 || year%400==0);
}

double myround(double x)
{
    double y;

    if (x >= 0.0)
    {
        y = floor(x);
        if (x - y >= 0.5)
            return y+1;
    }
    else
    {
        y = ceil(x);
        if (y - x >= 0.5)
            return y-1;
    }
    return y;
}



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刘艳明 lonny_liu@hotmail.com
2009-04-03 23:53:37

输入年份,判断是否为闰年
#include <stdio.h>
int main(void)
{
	int year;
	int is_leap_year(int year);
	printf("Enter a year :\n");
	scanf("%d",&year);
	is_leap_year(year);
	return 0;
}
int is_leap_year(int year)
{
	if (!(year%4))
	{	if(year%100)
			printf("%d is a leap year\n",year);
			else if(!(year%400))
				printf("%d is a leap year\n",year);
				else printf("%d is not a leap year\n",year);
	}
	else	printf("%d is not a leap year\n",year);
	return 0;
}


sunlick xxx@gmail.com
2009-06-01 17:40:49

#include <stdio.h>
void  is_leap_year(int year)
{
        if((year%4 == 0 && year%100 != 0) || year%400 == 0)
        {
                printf("%d 是闰年\n",year);
                return;
        }
        else
                printf("%d 不是闰年",year);
                return;

}

int main(void)
{
        int year;
        printf("Enter a year :\n");
        scanf("%d",&year);
        is_leap_year(year);
        return;
}


sunlick xxx@gmail.com
2009-07-10 17:49:55

#include <math.h>
#include <stdio.h>
double myround(double num)
{
        double numx = num-floor(num);
        double numy = ceil(num)-num;
        if(numx > numy)
        {
                printf("值为: %.2f", ceil(num));
        }else{
                printf("值为: %.2f", floor(num));
        }
}

main(void)
{
        double y=2.55;
        myround(y);
}


bcyx bc_yx@163.com
2009-08-03 02:53:38

下面这两个答案对吗?
1.
#include<stdio.h>
int is_leap_year(int year)
{
	if((year%4==0&&year%100!=0)||year%400==0)
	    printf("%d is leap year.\n",year);
    	else
	    printf("%d is not leap year.\n",year);
        return 0;
}
int main(void)
{
	int n;
	printf("Enter a year:");
	scanf("%d",&n);
	is_leap_year(n);
	return 0;
}
2.
#include <math.h>
#include <stdio.h>
double myround(double num)
{
        double numx = num-floor(num);
        double numy = ceil(num)-num;
        if((numx >= numy&&num>0)||!(numx<=numy&&num<0))
        {
                printf("rounding:%.1f\n", ceil(num));
                return 0;
        }else{
                printf("rounding:%.1f\n", floor(num));
                return 0;
        }
}

int main(void)
{
        double n;
        scanf("%lf",&n);
        myround(n);
        return 0;
}


zhuangzhy zhuangzhy@gmail.com
2009-08-12 10:29:21

#include<stdio.h>
int is_leap_year(int year){
        if(year%4==0 && year%100!=0 || year%400==0)
        printf("The year is leap year\n");
        else
        printf("The year isn't leap year\n");
}
int main(void){
        is_leap_year(2008);
        is_leap_year(2009);
}


mahang mahang2008@live.cn
2009-08-21 12:32:55

第一位同学做的对吗?


码匠 code_smith@sohu.com
2009-09-02 10:53:17

2.

#include <stdio.h>
#include <math.h>

double myround(double x)
{
	return floor(x+0.5);
}

int main(void)
{
	printf("myround(4.49) = %f\n", myround(4.49));
	printf("myround(4.59) = %f\n", myround(4.59));
	printf("myround(-3.51) = %f\n", myround(-3.51));
	printf("myround(-3.41) = %f\n", myround(-3.41));
	return 0;
}

提供一种方法,感觉不如sunlick的数学性好


码匠 code_smith@sohu.com
2009-09-02 11:03:08

1.
#include <stdio.h>

int is_leap_year(int year)
{
	return ( (!(year%4)&&(year%100))  ||  !(year%400) );
}

int main(void)
{
	printf("is_leap_year(2000) = %d\n", is_leap_year(2000));
	printf("is_leap_year(2001) = %d\n", is_leap_year(2001));
        printf("is_leap_year(2002) = %d\n", is_leap_year(2002));
	printf("is_leap_year(2003) = %d\n", is_leap_year(2003));
	printf("is_leap_year(2004) = %d\n", is_leap_year(2004));
	printf("is_leap_year(2009) = %d\n", is_leap_year(2009));
	printf("is_leap_year(1900) = %d\n", is_leap_year(1900));
	return 0;
}

写程序就像说话一样,那个爽!


tianyebj tianyebj@gmail.com
2009-09-20 20:29:29

#include <stdio.h>
double myround(double x){
	if (x > 0) {
		return (int)(x + 0.5);
	}else{
		return (int)(x - 0.5);
	}

}
int main(void) {
	double a = myround(-3.51);
	double b = myround(4.49);
	printf("%f %f\n", a, b);
}


mmmcat jy28520@gmail.com
2009-10-19 22:05:53

第一位同学好像2000年是个闰年吧?你的算法能出这个?


zyt shunzyt@163.com
2009-11-02 16:40:00

int is_leap_year(int year){
  if(year%100!=0&&year%4==0)
       return 1;
  if(year%400==0)
       return 1;
  return 0;



}


Frank blue_kenny@hotmail.com
2010-02-03 10:31:31

answer 1:

int is_leap_year(int year)
{
    if (year % 4 == 0 && year % 100 != 0 )
	return 1;
    elseif (year % 400 = 0)
	return 1;
    else
	return 0;
}


ben ben@wiredcraft.com
2010-03-16 19:14:35

myround(-3.51)的值是-4.0

这个不5入么 入不是变大么?咋就变小了呢?


zdx1314 zdx1314@163.com
2010-03-21 09:56:26

#include <stdio.h>
#include <math.h>
double myround(double num);

void main()
{
	double num;	
	printf("input a num:");
	scanf("%lf",&num);
	printf("%lf\n",myround(num));
}

double myround(double num)
{
	if(num>=0)
	{
		return floor(num+0.5);
	}	
	else
		return ceil(num-0.5);

}


laciqs 530107999@qq.com
2010-04-17 18:03:21

想了个自以为比较简洁的方法:
#include <stdio.h>
#include <math.h>

double myround(double x)
{
	int temp;
	if ((temp = ceil(x)) - x <= 0.5)
		return temp;
	else
		return floor(x);
}

int main(void)
{
	printf("%f\n", myround(3.5));
	return 0;
}


bowen zhangbowen_06@126.com
2010-05-01 14:30:23

#include <stdio.h>
#include <math.h>
double myround(double num);
main(void)
{
        double a = 2.55;
        myround(a);
}

double myround(double num)
{
        double num1 = num-floor(num);
        double num2 = ceil(num) - num;
        if(num1 > num2 )
        {
                 printf("%f\n",ceil(num));
        }
        else{
                 printf("%f\n", floor(num));
        }
}
编译的时候出现了以下的错误:

/tmp/ccYC5s8n.o: In function `main':
night.c:(.text+0x1b): undefined reference to `ceil'
collect2: ld returned 1 exit status
panabit@panabit-desk:~/cprogress$ vim eight.C
panabit@panabit-desk:~/cprogress$ vim seven.c
panabit@panabit-desk:~/cprogress$ vim six.c
panabit@panabit-desk:~/cprogress$ gcc six.c
/tmp/ccKpuCMl.o: In function `myround':
six.c:(.text+0x3c): undefined reference to `floor'
six.c:(.text+0x4f): undefined reference to `ceil'
six.c:(.text+0x74): undefined reference to `ceil'
six.c:(.text+0x92): undefined reference to `floor'
collect2: ld returned 1 exit status



宋劲杉 songjinshan@gmail.com
2010-05-11 09:32:56

没有加-lm


asdf codeghg@gmail.com
2010-06-06 15:01:53

#include <math.h>
#include <stdio.h>

/*
int is_leap_year(int year) {
  return (year%4==0 && year%100!=0) || year%400==0;
}

int main(void) {
  int i=1;
  while(i<=2010) {
    if(is_leap_year(i))
      printf("%d ",i);
    i=i+1;
  }
  printf("\n");
  return 0;
}
*/


double myround(double x) {
  if(ceil(x)-x<x-floor(x))
    return ceil(x);
  else if((ceil(x)-x==x-floor(x)) && x>0)
    return ceil(x);
  else if((ceil(x)-x==x-floor(x)) && x<=0)
    return floor(x);
  else
    return floor(x);
}

int main(void) {
  double x;
  printf("input a number:");
  scanf("%lf",&x);
  printf("四舍五入之后:%lf\n",myround(x));
  return 0;
}


mm mm@mm.mm
2010-07-30 20:12:41

#include<stdio.h>
#include<math.h>

int main(void)
{
	double x;
	double myround( double x);
	printf("这个一个求四舍五入的程序,请输入:");
	scanf("%lf",&x);
	myround(x);
	return 0;
}

double myround(double x)
{	
	double y=x+0.5;
	if ( x >0)
	{	if (y < ceil(x))
	        {	printf("四舍:%f\n",floor(x));
		}
		else
		{printf("五入:%f\n",ceil(x));
		}
	}
	else
	{	if (y > ceil(x))
		{	printf("四舍:%f\n",ceil(x));
		
		else
		{printf("五入:%f\n",floor(x));
		}
 	}	
	return 0;
}
	
第二道题目


goophile goophile@gmail.com
2010-07-31 16:03:41

看了楼上的答案,第二题那么多解法中,貌似只有4位同学是对的,其中9楼 tianyebj 同学和14楼 zdx1314 同学的解法最简洁,

tianyebj:
------------------代码分割线-----------------
double myround(double x)
{
    if (x > 0) 
        return (int)(x + 0.5);
    else
        return (int)(x - 0.5);
}
------------------代码分割线-----------------

zdx1314:
------------------代码分割线-----------------
double myround(double num)
{
    if(num>=0)
        return floor(num+0.5);
    else
        return ceil(num-0.5);
}
------------------代码分割线-----------------

这两种方法其实一样,因为double强制转换为int是向0截断,即正数取floor负数取ceil。

另外楼上 asdf & mm 也是正确的,其他我看着好像都有错,用1.5,-1.5测试一下即知。


laciqs 530107999@qq.com
2010-08-02 12:37:54

多谢LS提醒,我加了个fabs:
#include <stdio.h>
#include <math.h>

double myround(double x)
{
	int temp;

	if (fabs((temp = ceil(x))) - x <= 0.5)
		return temp;
	else
		return floor(x);	
}

int main(void)
{
	printf("%f\n", myround(1.5));
	return 0;
}


周海涛 yj_zhou1981@126.com http://learn.akae.cn/akabook/ch05s01_2
2010-10-03 10:12:55

觉得sunlick xxx@gmail.com 做的有些问题啊。当传的参数值正好是2.5或者-2.5之类的值时,是不对的。


肖德军 xhu_jun@126.com
2010-12-01 15:52:40

#include <stdio.h>
int is_leap_year(int x)
{
    return ((x%4==0 && x%100!=0)||(x%400==0));
}

int main(void)
{   
    int a;
    printf("Please input year number:\n");   
    scanf("%d",&a);
    if (is_leap_year(a)){printf("This is leap year!\n");}
    else                {printf("This is common year!\n");}                
    system("pause");
  
}   


xudonglee xudongleee@126.com
2011-01-19 19:34:08

//1

#include <stdio.h>

int is_leap_year(int year)
{
  if(((year % 4 == 0)&&(year % 100 != 0))||(year % 400 == 0))
    return 1;
  else
    return 0;
}

int main(void)
{
  int i, year;

  for(i = 0; ; i++)
  {

        scanf("%d", &year);
        if(is_leap_year(year))
          printf("%d is a leap year.\n", year);
        else
          printf("%d is not a leap year.\n", year);

        if(year == 9999)
          break;
  }
  return 0;
}

//2

#include <stdio.h>
#include <math.h>

double myround(double x)
{
  return floor(x);
}

int main(void)
{
  int i;
  double x;

  scanf("%lf", &x);
  printf("myround of %lf is %lf.\n", x, myround(x));

  return 0;
}



lingshiying lingshiying@126.com
2011-03-16 14:41:51

laciqs 530107999@qq.com 
2010-08-02 12:37:54


多谢LS提醒,我加了个fabs:
#include <stdio.h>
#include <math.h>

double myround(double x)
{
	int temp;

	if (fabs((temp = ceil(x))) - x <= 0.5)
		return temp;
	else
		return floor(x);	
}

int main(void)
{
	printf("%f\n", myround(1.5));
	return 0;
}

这个哥们的程序用有问题。用-2.6试试。你会返回-2而不是-3。


江民 vipstepstep@163.com
2011-05-16 15:29:39

# include "stdafx.h"

int is_leap_year(int year) {
	if(0 == year % 4 && 0 != year % 100 || 0 == year % 400) {
		return 1;
	}
	else {
		return 0;
	}
}

int main(void) {
	int year = 1999, result = 3;

	printf("Please input how is year\n");
	scanf("%d", &year);

	result = is_leap_year(year);

	if(1 == result) {
		printf("This year is leap year!\n");
	}
	else {
		printf("This year is not leap year!\n");
	}

	return 0;
}


江民 vipstepstep@163.com
2011-05-16 15:52:25

# include <stdio.h>
# include <math.h>

double myround(double x) {
	if(x > 0) {
		if(fabs(ceil(x) - x) <= 0.5) {
			//printf("ceil(x) - x = %lf\n", ceil(x) - x);
			//printf("fabs(ceil(x) - x) = %lf\n", fabs(ceil(x) - x));
			return ceil(x);

		}
		else {
			//printf("ceil(x) - x = %lf\n", ceil(x) - x);
			//printf("fabs(ceil(x) - x) = %lf\n", fabs(ceil(x) - x));
			return floor(x);
		}
	}
	else {
		if(fabs(floor(x) - x) <= 0.5) {
			//printf("floor(x) - x = %lf\n", floor(x) - x);
			//printf("fabs(floor(x) - x) = %lf\n", fabs(floor(x) - x));
			return floor(x);
		}
		else {
			//printf("floor(x) - x = %lf\n", floor(x) - x);
			//printf("fabs(floor(x) - x) = %lf\n", fabs(floor(x) - x));
			return ceil(x);
		}
	}

	
}


int main(void) {
	double x = 0, result = 0;

	printf("Please input no zero number!\n");

	scanf("%lf", &x);

	if(0 == x) {
		printf("Please input no zero number!\n");
		scanf("%lf", &x);
		while(0 == x) {
			printf("Please input no zero number!\n");
			scanf("%lf", &x);
		}
	}
	else {
		result = myround(x);
	}

	printf("The number after round is %lf\n", result);

	return 0;
}


key godcel5180@163.com
2011-06-04 01:25:03

#include<stdio.h>
#include<math.h>
int main(void)
{
        double myround(double);
        float i;
        printf("Please input a double_num: ");
        scanf("%f",&i);
        myround(i);
        return 0;
}
double myround(double num)
{
        int x;
        if(num>0)
        {
                x=(num*10);
                if(x%10>=5)
                {
                        printf("%.1f",ceil(num));
                        return 0;
                }
                else
                {
                        printf("%.1f",floor(num));
                        return 0;
                }
        }
        else
        {
                x=-num*10;
                if(x%10>=5)
                {
                        printf("%.1f",floor(num));
                        return 0;
                }
                else
                {
                        printf("%.1f",ceil(num));
                        return 0;
                }
        }
}

                else
                {
                        printf("%.1f",floor(num));
                        return 0;
                }
        }
        else
        {
                x=-num*10;
                if(x%10>=5)
                {
                        printf("%.1f",floor(num));
                        return 0;
                }
                else
                {
                        printf("%.1f",ceil(num));
                        return 0;
                }
        }
}


key godcel5180@163.com
2011-06-04 01:30:51

对不起,最后21行贴重复了,不能重新编辑。。。


大飞 shean@qq.com
2011-10-14 14:35:30

      1 #include<stdio.h>
      2 #include<math.h>
      3 double myround(double x)
      4 { if(x>=0){
      5    if((x-floor(x)) >= 0.5) {
      6    
      7      printf("you enter number is %.2lf,reson:%.2f",x,ceil(x));
      8 
      9    return 0;
     10 
     11 }else{
     12     
     13     printf("you enter number %.2lf,reson is:%.2f",x,floor(x));
     14    
     15    return 0;
     16 }}else{
     17    if ((ceil(x)-x)  >= 0.5)   {
     18        
     19        printf ("%lf",floor(x));
     20 
     21    return 0;
     22 }else{
     23     
     24     printf("%lf",ceil(x));
     25    return 0;
     26 }
     27 }
     28 }
     29 
     30 int main(void)
     31 {  
     32    double z;
     33    printf("Please enter a number with two decimal places: ");
     34    scanf("%lf",&z);
     35    myround(z);
     36    return 0;
     37 }
不知道有没有更简单的方法。


ivon yifeng.ivon.wang@hotmail.com
2011-11-15 01:20:04

/*
First Question
*/
#include <stdio.h>

int is_leap_year(int year)
{
	
	if(year%400==0)
	{
		printf("%d is a leap year.\n", year) ;
	}
	else
	{
		if(year%4==0&&year%100!=0) 
		{
			printf("%d is a leap year\n.", year) ;
		}
		else
		{
			printf("%d is NOT a leap year\n.", year) ;
		}
	}
	
	return 0 ;
}



int main(void)
{
	int year ;
	int i ;

	printf("Please input the year: It should be less than 10000 and more than 0.\n") ;
	printf("Year=");
	i = scanf("%d", &year) ;

	if(i == 1)
	{
		if(year<1||year>9999)
		{
			printf("It is NOt a correct input!\n") ;
		}
		else
		{
			is_leap_year(year) ;
		}
	} 
	else
	{
		printf("It is NOt a correct input!\n") ;
	}

	return 0 ;
}


ivon yifeng.ivon.wang@hotmail.com
2011-11-15 01:23:51

/*
Second Question
*/

#include <stdio.h>
#include <math.h>

int myround(double i)
{
	int k = (int)i ; 
	//printf("%d\n", k) ;

	if(i>=0.0)
	{
		if(i-k<0.5&&i-k>-0.5)
		{
			k = floor(i) ;
			//printf("A\n") ; 
		}
		else
		{
			k = ceil(i) ;
			//printf("B\n") ;
		}
	}
	else
	{
		if(i-k<0.5&&i-k>-0.5)
		{
			k = ceil(i) ;
			//printf("C\n") ;
		}
		else
		{
			k = floor(i) ;
			//printf("D\n") ;
		}
	}	

	printf("Number=%d\n", k) ;

	return 0 ;
}

int main(void)
{
	double i ;
	int j ;
	
	printf("Please input a number.\n") ;
	printf("Number=") ;
	j = scanf("%lf", &i) ;

	if(j == 1)
	{
		myround(i) ;
	}
	else
	{
		printf("It is NOt a correct input!\n") ;		
	}

	return 0 ;
}


lc liuchang8877@gmail.COM http://firefrog.sinaapp.com/
2012-05-31 17:33:03

  1 #include<stdio.h>
  2 #include<stdlib.h>
  3 
  4 int is_leap_year(int year);
  5 int main(int argc, char * argv[])
  6 {
  7 
  8     int leap_flag,year;
  9     printf("in put your year:>>>>>>\n");
 10     scanf("%d",&year);
 11     leap_flag = is_leap_year(year);
 12     if(!leap_flag)
 13         printf("this year:%d is leap year.",year);
 14     else
 15         printf("this year:%d is NOT leap year.",year);
 16 
 17 }
 18 
 19 
 20 int is_leap_year(int year)
 21 {
 22     if(0 == year%4){
 23         if(year%100 !=0){
 24             return 0;
 25         }
 26         else if(0 == year%400){
 27             return 0;
 28         }
 29         return 1;
 30     }
 31 
 32     return 1;
 33 }
 34 
 35 
 36 
 37 


liuchang liuchang8877@gmail.com http://firefrog.sinaapp.com/
2012-06-01 08:29:37

/*retry*/
  1 #include<stdio.h>
  2 #include<stdlib.h>
  3 
  4 int is_leap_year(int year);
  5 int main(int argc, char * argv[])
  6 {
  7 
  8     int leap_flag,year;
  9     printf("in put your year:>>>>>>\n");
 10     scanf("%d",&year);
 11     leap_flag = is_leap_year(year);
 12     if(!leap_flag)
 13         printf("this year:%d is leap year.",year);
 14     else
 15         printf("this year:%d is NOT leap year.",year);
 16 
 17 }
 18 
 19 
 20 int is_leap_year(int year)
 21 {
 22 
 23     if(0 == year % 400){
 24         return 0;
 25     }
 26     else if(0 == year%4){
 27         if(year%100 !=0){
 28             return 0;
 29         }
 30     }
 31 
 32     return 1;
 33 
 34 }


liuchang liuchang8877@gmail.com http://firefrog.sinaapp.com/
2012-06-01 16:56:41

  1 #include<stdio.h>
  2 #include<math.h>
  3 
  4 double myround(double num);
  5 
  6 double myround(double num)
  7 {
  8     double max,min;
  9     max=ceil(num);
 10     min=floor(num);
 11     printf("max:%lf\n",max);
 12     printf("min:%lf\n",min);
 13     printf("num:%lf\n",num);
 14     if(max - num <= num -min )
 15         return max;
 16     else
 17         return min;
 18 }
 19 
 20 
 21 int main(int argc,char * argv[])
 22 {
 23 
 24     double num,round_num;
 25     printf("In put your number: ====>");
 26     scanf("%lf",&num);
 27 
 28     round_num=myround(num);
 29 
 30     printf("your number is:%.1lf",round_num);
 31 }


阿铭linux 111@aminglinux.com
2012-07-04 17:31:25

第二题:
#include <stdio.h>
#include <math.h>

double myround(double x)
{
    if (x>=0)
    {
        if (floor(x+0.5)==floor(x))
            printf ("%f\n",floor(x));
        if (floor(x+0.5)>floor(x))
            printf ("%f\n",ceil(x));
    }
    else
    {
        if (floor(-x+0.5)==floor(-x))
            printf ("%f\n",-floor(-x));
        if (floor(-x+0.5)>floor(-x))
            printf ("%f\n",-ceil(-x));
    }


}
int main()
{
    double x=-1.1 ,y=4.49, z=-3.51;
    myround(x);
    myround(y);
    myround(z);
    return 0;
}


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