CODEWITHSUNDEEP
c++
S.Iskandr
S.Iskandr

Reputation: 57

How to accept integer only and ignore other data types?

I'm a beginner in C++ and I'm wondering if you can help me.

I'm making a program and error checking is required for this program. So, how can I accept integer only and ignore other data type?

For example:

int tilenumber;
cin >> tilenumber;
cin.clear();
cin.ignore();
cin >> words;

When my code runs:

Input : 1 hey i wanna dance

Output : ey i wanna dance

///

What I want:

Case 1: Input : 1

hey i wanna dance

Output : hey i wanna dance

Case 2: Input : 1e

hey i wanna dance

Output : hey i wanna dance

Why does my code not working?

I tried to solve my problem with my code like above but it's not working.

Thanks.

Upvotes: 0

Views: 306

Answers (1)

Ron
Ron

Reputation: 15521

Read the entire string and utilize the std::stoi function:

#include <iostream>
#include <string>
int main() {
    std::cout << "Enter an integer: ";
    std::string tempstr;
    std::getline(std::cin, tempstr);
    try {
        int result = std::stoi(tempstr);
        std::cout << "The result is: " << result;
    }
    catch (std::invalid_argument) {
        std::cout << "Could not convert to integer.";
    }
}

Alternative is to utilize the std::stringstream and do the parsing:

#include <iostream>
#include <string>
#include <sstream>
int main() {
    std::cout << "Enter an integer: ";
    std::string tempstr;
    std::getline(std::cin, tempstr);
    std::stringstream ss(tempstr);
    int result;
    if (ss >> result) {
        std::cout << "The result is: " << result;
    }
    else {
        std::cout << "Could not convert to integer.";
    }
}

Upvotes: 1

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