Jumping into C++

[Tamim Ad Dari]

Is there any way to check whether the user has inputed an integer or string, for example I want to tell the user when he has entered a letter in the following program which adds the numbers with previous,

#include <iostream>

using namespace std;


int main()
{
    int x;
    cin>>x;
    int y;
    while (true){


    cin>>y;


    cout<<x+y;


x=x+y;








    }
}

that "invalid input,please only insert numbers" ? it seems when I enter letter as input it forms an infinite loop.

[whiteflags]

Read the site's tutorials if the book really doesn't go into it: A Gentle Introduction to IO Streams in C++ - Cprogramming.com

[Tamim Ad Dari]

Read the site's tutorials if the book really doesn't go into it: A Gentle Introduction to IO Streams in C++ - Cprogramming.com

I couldnt find what I was looking for, I wanted to check whether the user has inputted an integer or string and reply accordingly..

[kmdv]

I couldnt find what I was looking for, I wanted to check whether the user has inputted an integer or string and reply accordingly..

You have to specify exactly what is a string and what is an integer. If string is everything that is not an integer, first attempt to read input as an integer, and if that fails, read it as a string.

And please, start giving your threads more meaningful names.

[C_ntua]

I couldnt find what I was looking for, I wanted to check whether the user has inputted an integer or string and reply accordingly..

Look at that link where it says "Error handling with IO streams"

You can also just read the user input into a string and then handle the input by checking first if it is a string. This separates the problem into first handling I/O and then interpreting I/O.

std::string input;
//get the input first
std::getline(std::cin, input);
//then use string stream to convert the input to number or any other method
int number;
std::stringstream sstr(input);
if (sstr >> input) {
   //input contains the first integer the user inputted before pressing enter
}