change the value of user-inputed string

[xplainet]

I have a code where the user inputs a string against 2 options.
Dog and Cat

It then checks it against DOG/CAT dog/cat and Dog/Cat and goes to another function depending on the 2 options.

but before it jumps to the next function I want it to change the string to Dog or Cat
So that the carried value wouldn't be DOG or CAT.


So i just want to change a string..

[Jazpy]

You could manually change the value, or use these two functions:

http://www.cplusplus.com/reference/cctype/toupper/

http://www.cplusplus.com/reference/cctype/tolower/

[booradley60]

Overkill, perhaps? But if you're normalizing the input string in order to make decisions on it, you may just want to use an enum anyway.

#include <iostream>
#include <string>

enum Animal { DOG, CAT, UNKNOWN };

Animal getAnimalTypeFromString(std::string animal)
{
    if (animal == "DOG" || animal == "dog" || animal == "Dog")
    {
        return Animal::DOG;
    }
    else if (animal == "CAT" || animal == "cat" || animal == "Cat")
    {
        return Animal::CAT;
    }

    return Animal::UNKNOWN;
}

int main()
{
    std::string usrInput;
    std::cout << "What kind of animal? (Dog or Cat): ";
    std::getline(std::cin, usrInput);

    std::string normalizedInput;
    switch(getAnimalTypeFromString(usrInput))
    {
    case Animal::DOG:
        normalizedInput = "Dog";
        break;
    case Animal::CAT:
        normalizedInput = "Cat";
        break;
    case Animal::UNKNOWN: 
        //intentionall fall-through
    default:
        std::cout << "Didn't recognize animal type!" << std::endl;
        return 1;
    }

    std::cout << "The string I'm using now is: " << normalizedInput << std::endl;
    return 0;
}

That's probably ridiculous. This could do just fine.

#include <iostream>
#include <string>

std::string normalizeInput(std::string animal)
{
    if (animal == "DOG" || animal == "dog" || animal == "Dog") { return "Dog"; }
    else if (animal == "CAT" || animal == "cat" || animal == "Cat") { return "Cat"; }
    else { return "Unknown"; } //or empty string here instead??
}

int main()
{
    std::string usrInput;
    std::cout << "What kind of animal? (Dog or Cat): ";
    std::getline(std::cin, usrInput);

    std::string normalizedInput = normalizeInput(usrInput);

    std::cout << "The string I'm using now is: " << normalizedInput << std::endl;
    return 0;
}

[xplainet]

obviously i made the question very complicated as all i wanted to do was

string mystring;
mystring = "change";

Thanks anyway, ill take note of your replies.

[giblit]

I think the op is inputting a string then he converts it to all upper case and then does an if statement and wants to change it back to camel case.

Option 1) Use a temp string to convert to uppercase and compare
Option 2) Create a function like this

std::string camel_case( std::string str )
{
    const int SIZE = str.size();
    if( str[0] >= 'a' && str[0] <= 'z' ) str[0] -= ' ';
    for( int i = 1; i < SIZE; ++i )
    {
        if( str[i] >= 'A' && str[i] <= 'Z' ) str[i] += ' ';
    }
    return( str );
}

http://ideone.com/qT9e4y