3 replies to this topic

[Hamed]

I have file by the name:A.in

it have txt format like:

12 12 12 12 12
3 3 3 3 3
12 12 12 12 12
23 23 23 23 23

I use this code to read 1st line how can read other line with line number/

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
    int a,b,c,d,e;
    ifstream myfile("A.in");
    myfile>>a>>b>>c>>d>>e;
    cout<<a+b+c;
    system("pause");
    return 0;
}

[AdvMutant]

Hmm... Maybe you can use fgets()?
The declaration looks like so -

Quote

fgets( char*, size_t, file_stream );

Read more about it here. All the mentioned functions are in "stdio.h".

[Hamed]

I want to do it with ifstream if possible!

[Alexander]

Hamed said:

I want to do it with ifstream if possible!

This should work:

#include <fstream>
#include <iostream>
#include <sstream>
using namespace std;

int main()
{
    int a,b,c,d,e;
    ifstream myfile("A.in");
    char line[255];
     
    while(myfile.getline(line, 255)) {
        myfile >> a >> b >> c >> d >> e;
        cout << (a + b + c) << endl;
    }

    system("pause");
    return 0;
}