Use C atoll function to convert string to long long type

Syntax

C atoll function has the following format.

Header

C atoll function is from header file stdlib.h.

Description

C atoll function converts the string pointed to by str into a long long int value. It is otherwise similar to atol().

Example

C atoll function converts string to long long type.

#include <stdlib.h>
#include <stdio.h>
/*from  w  w w. j av  a 2 s  .c  o m*/
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;
}

The code above generates the following result.