CODEWITHSUNDEEP
c++c++11
Ranjith K
Ranjith K

Reputation: 21

how do I check the data type of the given input in cpp?

If I give 10 means it should print it is a integer If I give 10.2 means it should print it is a float If I give 'a' means it should print it is a char

Upvotes: 2

Views: 94

Answers (2)

sonulohani
sonulohani

Reputation: 1313

You can use type_traits and template specialization to achieve this. Please see this example for more info:-

#include <iostream>
#include <type_traits>

template<typename T>
struct is_integer{
    static const bool value = false;
};

template<>
struct is_integer<int>{
    static const bool value = true;
};

template<typename T>
struct is_char{
    static const bool value = false;
};

template<>
struct is_char<char>{
    static const bool value = true;
};

template<typename T>
void printType(T t){
    if(is_integer<T>::value)
    {
        std::cout<<"Value is integer"<<std::endl;
    }
    else if(is_char<T>::value)
    {
        std::cout<<"Value is char"<<std::endl;
    }
    else if(std::is_floating_point<T>::value)
    {
        std::cout<<"Value is float"<<std::endl;
    }
}

int main()
{
    int i = 10;
    char j = 'a';
    float k = 10.2f;

    printType(i);
    printType(j);
    printType(k);

    return 0;
}

Upvotes: 0

Remy Lebeau
Remy Lebeau

Reputation: 598319

Read the input as a std::string first.

Then, pass the string to std::stoi(), and if it consumes the whole string without error, print the resulting integer.

Otherwise, pass the string to std::stof() , and if it consumes the whole string without error, print the resulting float.

Otherwise, print the string as-is.

Upvotes: 1

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