函数名: ceil
功 能: 向上舍入
用 法: double ceil(double x);
包含于头文件:math.h
程序例:
#include <stdio.h>
#include <math.h>
int main(void)
{
double number = 123.54;
double down, up;
down = floor(number);
up = ceil(number);
printf("original number %5.2lf
", number);
printf("number rounded down %5.2lf
", down);
printf("number rounded up %5.2lf
", up);
return 0;
}
运行结果：
original number 123.54
number rounded down 123.00
number rounded up 124.00
