Thread: how to calculate billion number

i want write program to calculate billion number but when i input a lot of number my program will show negative number

this my code

Code:

int main()
{
    double long a,b,c;
    
    scanf ("%d",&a);
    scanf ("%d",&b);
    c=a+b;
    printf("%d",c);
    
    
getch();
    }

why don't work?

plz help me


ps.sorry my eng is not strong.

i use turbo c++

thx for u help

i think it came out in '91

int can only hold values of -32,768 through 32,767. Try compling this bit of code (Taken from SAMS Teach Yourself C++ In 24 Hours)

Code:

#include <iostream>

int main()
{
       int smallNumber;
       smallNumber = 32767;
       std::cout << "small number:" << smallNumber << std::endl;
       smallNumber++;
       std::cout << "small number" << smallNumber << std::endl;
       smallNumber++;
       std::cout << "small number" << smallNumber << std::endl;
       return 0;

}

When you see the output, you will notice that after I increment the number with ++, it wraps around to the smallest number it can hold, which is -32767. This is called (you guessed it) "Wrap Around." Use an unsigned long int for positive #s up to 4,294,967,295. Hope it helps, a fellow n00b programmer, Sintu

long long isn't standard but it's reasonably well supported I think.