C language: input a plastic data in the main function, call the sub-function to find its absolute value, and output it in the main function.
# contains "stdio.h"
int fabs 1(int x)
{
if(x & lt； 0)return-x；
Otherwise, return x;
}
Master ()
{
int n；
scanf("%d "，& ampn)；
printf("%d "，fabs 1(n))；
}