How to calculate the absolute value and keep two decimal places in C language?

In C language, you can use the fabs function to calculate the absolute value and use the printf function to output with two decimal places.

The sample code is shown below:

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

int main() {
    double num = -3.14159;
    double abs_num = fabs(num);
    
    printf("绝对值保留两位小数: %.2f\n", abs_num);
    
    return 0;
}

Output result:

绝对值保留两位小数: 3.14