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Issue with stringoperator[]

  1. Jun 26, 2012 #1
    #include <iostream>
    #include <string>

    using namespace std;

    void str2hex(string str) {

    int strlen = str.length(); // Assign the length of input/str to strlen
    string hex[strlen]; // Initialize the Array hex with the length of the string

    for (int x = 0; x < strlen; x++){ // Create a for loop assigning the values of the string to hex as hexadecimal values.

    if (str[x] == " "){

    hex[x] = 20;




    int main()

    string input; // Declaring the string which will be converted into HEX
    getline(cin,input); // Gets the user's input for the string
    str2hex(input); // Inserts the user's input into the str2hex function

    return 0;

    In this program the issue is occuring on the line with if(str[x] == " ") {

    the error i'm getting is: comparison with string literal results in unspecified behaviour
    I can't figure out what is wrong. I am new to C++ so please don't scold me. Thank - you.
  2. jcsd
  3. Jun 26, 2012 #2


    User Avatar

    Staff: Mentor

    Isn't str[x] a character? If so, you should compare it to a character ' ', not a string " ".
  4. Jun 26, 2012 #3
    Thank you very much! Works perfectly! I'm such a novice -.-
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