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c++ cin from string

Mohamed Farid answered on July 6, 2022 Popularity 9/10 Helpfulness 4/10

answer c++ cin from string

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c++ cin from string

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// To take input from a string instead of stdin, you can you use std::istringstream
// This is useful in a lot of UVA problems
// This is an Example for it using a simple calculator

#include <iostream>
// sstream should be included to use istringstream
#include <sstream>

using namespace std;

// This function takes a line input and return the equation as a tuple
tuple<int, char, int> getEquationFromLine(string line){
  // Let's say Line is "2 + 3"
    int firstNumber, secondNumber;
    char operation;
    istringstream iss(line);
    iss >> firstNumber;
  // firstNumber is now 2
    iss >> operation;
  // operation is now +
    iss >> secondNumber;
  // secondNumber is now 3
    return {firstNumber, operation, secondNumber};
}

int main() {
    string equationLine;
    getline(cin, equationLine);
    tuple<int, char, int> equation = getEquationFromLine(equationLine);
  // Just printing the answer of the equation
    switch (get<1>(equation)) {
        case '+': cout << get<0>(equation) + get<2>(equation);
            break;
        case '-': cout << get<0>(equation) - get<2>(equation);
            break;
        case '*': cout << get<0>(equation) * get<2>(equation);
            break;
        case '/': cout << get<0>(equation) / (double)get<2>(equation);
            break;
        default:cout << "INVALID";
    }
}

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Contributed on Jul 15 2023

Mohamed Farid

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c++ cin string

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#include <iostream>
using namespace std;
int main () {
	String a; 
  	cin>>a; //takes b and stores it into a variable
  	cout<<a; //should output b
}

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Contributed on Jul 06 2022

max

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c++ cin from string

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