CODEWITHSUNDEEP
linuxterminalgnome-terminal
Kanishk
Kanishk

Reputation: 21

Get input from terminal during runtime of a C++ program

In GNOME terminal and XTerm in Ubuntu, I'm facing this problem: I am forced to input values for all cin statements, irrespective of where they appear in source code, and only at the end executes all the cout statements. For instance:

int main()
{
    int a;
    cout<<"Enter a :";
    cin>>a;
    cout<<"\n";
    return 0;
}

When I run this code (using g++), I am forced to to input the value for a before the first cout statement runs.

kanishk509@kanishk509-hp:~/Hackerearth$ g++ -Wall -o sample sample.cpp kanishk509@kanishk509-hp:~/Hackerearth$ ./sample 5 Enter a :

image

The '5' is the input that I am forced to provide to the statement cin>>a before the any cout statement runs.

Upvotes: 1

Views: 2095

Answers (1)

Kanishk
Kanishk

Reputation: 21

Using std::flush solved the problem.

int main()
{
    int a;
    cout<<"Enter a :"<<flush;
    cin>>a;
    cout<<"\n";
    return 0;
}



kanishk509@kanishk509-hp:~/Hackerearth$ g++ -Wall -o sample sample.cpp
kanishk509@kanishk509-hp:~/Hackerearth$ ./sample
Enter a :5

Upvotes: 1

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