C Tutorial/stdlib.h/atoll

atoll

Item Value Header file stdlib.h Declaration long long int atoll(const char *str); Function converts the string pointed to by str into a long long int value. It is otherwise similar to atol().

<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.", atoll(num1)+atoll(num2));
   return 0;
 }</source>