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atoll - Converts the string into long long int value in C++

//ATOLL() FUNCTION

#include<iostream.h>
#include<stdlib.h>
#include<conio.h>
void main()
{
char num1[30],num2[30];
cout<<"Enter first:";
cin>>num1;
cout<<"Enter second:";
cin>>num2;
cout<<"The sum is:"<< atoll(num1)+atoll(num2);
getch();
}