CODEWITHSUNDEEP
c++
Dr. Alien
Dr. Alien

Reputation: 21

Changing decimal dot to a comma

The code goes like this:

Input: Decimal number N, dot needs to be switched with notch, e.g. input: 0.36
output: 0,36

I have been thinking about it for a couple of hours already but can't figure how to solve it. Can someone help?

Upvotes: 1

Views: 1778

Answers (2)

Adrian Mole
Adrian Mole

Reputation: 51815

You can do this by setting the locale for the cin and cout streams using the std::imbue() function.

The following example uses the English/US (dot) decimal separator for input and the French (comma) for output; swapping the arguments for the two imbue calls will reverse this.

#include <iostream>
#include <locale>

int main()
{
    std::cin.imbue(std::locale("en_US"));   // Set INPUT to use the DOT
    std::cout.imbue(std::locale("fr_FR"));  // Set OUTPUT to use a COMMA
    double test;
    std::cout << "Enter a number: ";
    std::cin >> test;
    std::cout << "Number was: " << test << std::endl;
    return 0;
}

The std::locale section of the C++ Standard Template Library provides numerous options for customising (and fine-tuning) numeric input/output formats, but the techniques it offers are not trivial to master.

Upvotes: 4

Aykhan Hagverdili
Aykhan Hagverdili

Reputation: 29945

You can read the number as text, and then use std::replace:

#include <iostream>
#include <string>
#include <algorithm>

int main()
{
    std::string number;
    std::cin >> number;
    std::replace(number.begin(), number.end(), '.', ',');
    std::cout << number << '\n';
}

Upvotes: 1

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