Case sensitive string comparison in C++

Question

Can anyone pls let me know the exact c++ code of case sensitive comparison function of string class?

Please give your questions more descriptive titles -- "C++ Object Oriented Programming" is way too generic. I've gone in and done this one for you. — Martin B
– Martin B, Commented Aug 10, 2010 at 10:24
String comparison is case sensitive by default. Just use operator== for std::string. — Kirill V. Lyadvinsky
– Kirill V. Lyadvinsky, Commented Aug 10, 2010 at 10:36

graham.reeds · Accepted Answer · 2010-08-10 10:48:14Z

5

How about?

std::string str1, str2;
/* do stuff to str1 and str2 */
if (str1 == str2) { /* do something */ }

Or

if (str1.compare(str2) == 0) { /* the strings are the same */ }

edited Aug 10, 2010 at 10:48

answered Aug 10, 2010 at 10:32

graham.reeds

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DumbCoder · Accepted Answer · 2010-08-10 10:53:14Z

4

std::string str1("A new String");
std::string str2("a new STring");
if(str1.compare(str2) == 0)
    std::cout<<"Equal";     // str1("A new String") str2("A new String");
else 
    std::cout<<"unEqual";   //str1("A new String") str2("a new STring")

compare() returns an integral value rather than a boolean value. Return value has the following meaning: 0 means equal, a value less than zero means less than, and a value greater than zero means greater than

edited Aug 10, 2010 at 10:53

answered Aug 10, 2010 at 10:34

DumbCoder

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2 Comments

Aman Saleem Over a year ago

Can u pls give the code in output of that the str1 is equal to str2 if both strings are equal & give the output that str1 is not equal to str2 if both the string are not equal?

Loki Astari Over a year ago

Why would you use compare rather than operator== ?

Community · Accepted Answer · 2017-05-23 10:31:23Z

2

== is overloaded for string comparison in C++ AFAIK (unlike in Java, where u have to use myString.equals(..))

If you want to ignore case when comparing, just convert both strings to upper or lower case as explained here: Convert a String In C++ To Upper Case

edited May 23, 2017 at 10:31

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answered Aug 10, 2010 at 10:32

Nils

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Arjit · Accepted Answer · 2010-08-10 10:32:53Z

1

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

int main ()
{
  string str1 ("green apple");
  string str2 ("red apple");

  if (str1.compare(str2) != 0)
    cout << str1 << " is not " << str2 << "\n";

  if (str1.compare(6,5,"apple") == 0)
    cout << "still, " << str1 << " is an apple\n";

  if (str2.compare(str2.size()-5,5,"apple") == 0)
    cout << "and " << str2 << " is also an apple\n";

  if (str1.compare(6,5,str2,4,5) == 0)
    cout << "therefore, both are apples\n";

  return 0;
}

I got it from http://www.cplusplus.com/reference/string/string/compare/

Hope google work !!

But use == operator like s1 == s2 would also work good

answered Aug 10, 2010 at 10:32

Arjit

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