C Tutorial/stdlib.h/atol
atol
Item Value Header file stdlib.h Declaration long int atol(const char *str); Function converts the string into a long int value.
<source lang="cpp">#include <stdlib.h>
#include <stdio.h> int main(void) { char num1[80], num2[80]; printf("Enter first: "); gets(num1); printf("Enter second: "); gets(num2); printf("The sum is: %ld.", atol(num1)+atol(num2)); return 0; }</source>