浮点数转换为整数四舍五入

Given a float value and we have to round the value to the nearest integer with the help of Macro in C language.

给定一个浮点值，我们必须借助C语言中的Macro将其舍入到最接近的整数。

Macro Definition:

宏定义：

    #define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

Example:

例：

    Input:
float val1=10.00f;
float val2=10.23f;
float val3=10.50f;
float val4=10.65f;
Output:
After round val1=10
After round val2=10
After round val3=11
After round val4=11

Program:

程序：

#include <stdio.h>
//Macro
#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
//Main code 
int main(void)
{
float val1=10.00f;
float val2=10.23f;
float val3=10.50f;
float val4=10.65f;
printf("After round val1=%d\n",round(val1));
printf("After round val2=%d\n",round(val2));
printf("After round val3=%d\n",round(val3));
printf("After round val4=%d\n",round(val4));
return 0;
}

Output

输出量

After round val1=10
After round val2=10
After round val3=11
After round val4=11 

翻译自: https://www.includehelp.com/c-programs/define-a-macro-to-round-a-float-value-to-nearest-integer-in-c.aspx

浮点数转换为整数四舍五入