C/stdlib.h/llabs

llabs: returns the absolute value of num

<source lang="cpp">

//Declaration: long long int llabs(long long int num);

 #include <stdlib.h>
 #include <stdio.h>

 int main(void){
   char num[80];
   printf("a number:");
   gets(num);
   return llabs(atol(num));
 }
        

/* a number:2

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      </source>