CODEWITHSUNDEEP
c++
Jonathan Bouchard
Jonathan Bouchard

Reputation: 443

No operator "==" matches these operands string

I have a problem with this code, I'm trying to verify if a letter is in a word, but for some reasons it won't allow me to put ==.

#include <string>
#include <iostream> 
using namespace std;

bool Verification(string a, string b)
{
    bool VF = false;
    for (int i = 0; i < a.size(); i++)
    {
        if (a[i] == b) //Here is the problem
        {
            VF = true;
        }

    }
    return VF;
}

Upvotes: 0

Views: 608

Answers (1)

Yeldar Kurmangaliyev
Yeldar Kurmangaliyev

Reputation: 34189

a is a string and b is a string.
a[i] is a char. You compare char to string - obviously, it will not work.

If you want to check if a letter (i.e. char) exists in a sentence (i.e. string), you can implement the function this way:

bool Verification(string a, char b) // <-- notice: b is char
{
    bool VF = false;
    for (int i = 0; i < a.size(); i++)
    {
        if (a[i] == b) 
        {
            VF = true;
        }
    }
    return VF;
}    

// Usage:
Verification("abc", 'a'); // <-- notice: quotes are double for string and single for char

Actually, there is a method string::find, which can help you to find an occurence of string or char in another string You can replace your code with:

#include <string>
#include <iostream> 
using namespace std;

bool Verification(string a, char b)
{
    return a.find(b) != string::npos;
}

Upvotes: 4

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