C语言绝对值函数如何调用

C语言中的绝对值函数是abs()，它可以用于计算整数、浮点数或长整数的绝对值。调用abs()函数只需在括号内输入需要取绝对值的值即可。

示例代码如下：

#include <stdio.h>#include <stdlib.h>int main() {    int num = -10;    int absNum = abs(num);    printf("The absolute value of %d is %d\n", num, absNum);    float fnum = -3.14;    float absFnum = abs(fnum);    printf("The absolute value of %.2f is %.2f\n", fnum, absFnum);    long long llnum = -1234567890;    long long absLLnum = abs(llnum);    printf("The absolute value of %lld is %lld\n", llnum, absLLnum);    return 0;}

输出结果：

The absolute value of -10 is 10The absolute value of -3.14 is 3.14The absolute value of -1234567890 is 1234567890