🗿jjabrahams567

comparing two strings

Nov 18, 2014 at 5:43am

This program is supposed ask the user to input two phrases and return whether they are the same or not. It's working for a single word, but for some reason it stops checking if it hits a space. Can figure out why. I Thought getline was supposed to take in spaces.

  #include <iostream>
#include <string>
#include <iomanip>

using namespace std;

string inputOne; // user's first input
string inputTwo; // user's second input

bool misMatch = false; //to determine if a misnatcg pair is found

void compare (string inputOne, string inputTwo, bool misMatch);

//main function asks user for two inputs
int main () {

    //ask the user to type the first string
    cout << "Please type a word: " << endl;
    getline (cin, inputOne); //store the entered phrase in string inputOne

    //ask the user to type the second string
    cout << "Please retype the word exactly: " << endl;
    getline (cin, inputTwo); //store the entered phrase in string inputTwo

    compare(inputOne, inputTwo, misMatch);

return 0;
}

/*******************************************************************************
compair funtion compares the two inputs and returns true or false to the
main function
*******************************************************************************/
void compare (string inputOne, string inputTwo, bool misMatch)
{
    if (inputOne.length() == inputTwo.length())
    {

        int i; //integer to hold the value of character being checked

        // loops through each character in the input
        for (i = 0; i < inputTwo.length(); i++)
        {
            //check each character in string one to string two
            if (inputOne.at(i) != inputTwo.at(i))
            {
                cout << "The inputs DONT'T match." << endl;
                return;
            }
        }
    }

    cout << "The inputs match." << endl;
}

Edit & run on cpp.sh


Please type a word: 
hello 
Please retype the word exactly: 
hello o
The inputs match.

Last edited on Nov 18, 2014 at 5:43am

Nov 18, 2014 at 5:51am

TheKingOfTyrants (232)

The problem comes from they two strings don't match length, so the if-statement block of code from lines 37-51 never execute and the program subsequently jumps to line 53 and outputs that the inputs match. You need to reposition line 53 to inside the if-statement after you've checked all the letters. That way it will only execute if the two strings are the same length AND all letters match.

Nov 18, 2014 at 5:51am

jlb (4973)

Why all the logic in your "compare" function. Your using C++ strings why not either use the comparison operator== or the std::string.compare() function?

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comparing two strings