add each content.read from file

[pradeep rawat]

my this programm just doing the square of every first number it gets.
my file is like
120
22
code :
#include<cmath>
#include<cstdlib>
#include<iostream>
#include<fstream>
using namespace std;
int main ()

{
char filename [25];
ifstream myfile;
cin.getline(filename,25);
myfile.open(filename);
if (!myfile.is_open())
{
exit (0);
}
char number[25];
while (myfile.good ())
{
myfile.getline(number,25);

int num=atoi(number);
cout << num + num<< endl;
}
}
output: 240
44
0
i want those two values of file to be added like total= 120 + 22 =142.

[Volatile Pulse]

240
44
0

From that, I can tell you have a blank line at the end of your file. I don't think you want that.

i want those two values of file to be added like total= 120 + 22 =142.

Well, you need to make another variable, maybe called sum, that will add everything up for you.

Also, why is number a character? That makes no sense. Why not make it an int or a float at the least?

Anyways, a quick example:

int sum = 0;
//...
sum += num + num;
cout << sum;
//... 

[pradeep rawat]

#include<cmath>
#include<cstdlib>
#include<iostream>
#include<fstream>
using namespace std;
int main ()

{
char filename [25];
ifstream myfile;
cin.getline(filename,25);
myfile.open(filename);
if (!myfile.is_open())
{
exit (0);
}
char number[25];
while (myfile.good ())
{
myfile.getline(number,25);

int num=atoi(number);
int sum = 0 ;
sum+= (num + num) ;
cout << sum;
}
}
i did this bt still same result

[pradeep rawat]

240
44
0

[Volatile Pulse]

Put sum at the beginning of main with the rest of your variables. Also, move your cout statement outside of the while loop.

[pradeep rawat]

thanks it working now properly