C Programming Tutorial - Absolute Value with abs

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<ctype.h>
#include<string.h>

int main() {
 
   int year1;
   int year2;
   int age;
 
   printf("Enter a year \n");
   scanf(" %d", &year1);
 
   printf("Enter a year \n");
   scanf(" %d", &year2);
 
   age = year1 - year2;
   printf("%d \n", age);
 
   age = abs(age);
   printf("%d \n", age);
 
   return 0;
}

printf("%f \n", pow(5, 3) ); 

sqrt(164)