C语言数学函数ceil(), floor(), round()
用法：
#include <math.h> double ceil(double x); double floor(double x); double round(double x);
ceil(x)返回不小于x的最小整数值（然后转换为double型）。
floor(x)返回不大于x的最大整数值。
round(x)返回x的四舍五入整数值。
给个例子test.c：
#include <stdio.h>
#include <math.h>
int main(int argc, const char *argv[])
{
float num = 1.4999;
printf("ceil(%f) is %f\n", num, ceil(num));
printf("floor(%f) is %f\n", num, floor(num));
printf("round(%f) is %f\n", num, round(num));
return 0;
}
编译：$cc test.c -lm 执行：$./a.out ceil(1.499900) is 2.000000 floor(1.499900) is 1.000000 round(1.499900) is 1.000000
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2022年9月24日 14:05
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