CODEWITHSUNDEEP
c++string-comparisonstrcmp
user324463
user324463

Reputation: 21

string Comparison

I want to compare two user input strings, but not able to do so...

#include "stdafx.h"
#include "iostream"
#include "string"
using namespace std;

int _tmain(int argc, _TCHAR* argv0[])
{
    string my_string;
    string my_string2;
    cout<<"Enter string"<<endl;
    cin>>my_string;
    cout<<"Enter 2nd string"<<endl;
    cin>>my_string2;
    cout<<my_string<<"  "<<my_string2;
    strcmp(my_string,my_string2);
    int result;
    result= strcmp(my_string,my_string2);
    cout<<result<<endl;
    return 0;
}

This error is appearing. Error 1 error C2664: 'strcmp' : cannot convert parameter 1 from 'std::string' to 'const char *' c:\users\asad\documents\visual studio 2008\projects\string\string\string.cpp 23 String

Upvotes: 2

Views: 11479

Answers (4)

Sagar
Sagar

Reputation: 9503

Your includes:

Since you are including standard headers, they should be in <>

#include <string>
#include <iostream>

#include with "" is generally used for your own header files, not standard header files.

You are using C++, and therefore need not use strcmp. In C++, you can simply use == & != to compare two strings.

if (my_string == my_string2) result = 0;
else result = 1;

Also, if you want to convert a string to a const char*, you can use mystring.c_str()

Upvotes: 4

Romain Hippeau
Romain Hippeau

Reputation: 24375

Another way to do this is also

result= strcmp(my_string.c_str(),my_string2.c_str());

Upvotes: 0

Cristina
Cristina

Reputation: 2001

If you want to use strcmp note that it takes different parameters than the ones you used.

http://www.cppreference.com/wiki/c/string/strcmp

Upvotes: 0

Jerry Coffin
Jerry Coffin

Reputation: 490058

Since you're using std::string, strcmp is unnecessary -- you can just use <, ==, !=, etc.

Upvotes: 5

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