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C++ Program to compare two string using pointers

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  • Last Updated : 07 Sep, 2022
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Given two strings, compare the strings using pointers 

Examples:

Input: str1 = geeks, str2 = geeks
Output: Both are equal

Input: str1 = hello, str2 = hellu
Output: Both are not equal
As their length are same but characters are different

The idea is to dereference given pointers, compare values and advance both of them. 

C++




// C++ Program to compare two strings using
// Pointers
#include <iostream>
using namespace std;
 
 
// Method to compare two string
// using pointer
bool compare(char *str1, char *str2)
{
    while (*str1 == *str2)
    {
        if (*str1 == '\0' && *str2 == '\0')
            return true;
        str1++;
        str2++;
    }    
 
    return false;
}
 
int main()
{
    // Declare and Initialize two strings
    char str1[] = "geeks";
    char str2[] = "geeks";
 
    if (compare(str1, str2) == 1)
        cout << str1 << " " << str2 << " are Equal";
    else
        cout << str1 << " " << str2 << " are not Equal";
}


Output

geeks geeks are Equal

Complexity analysis:

  • Time Complexity: O(min(M, N)), where M and N represents the length of the given strings.
  • Auxiliary Space: O(1), no extra space is required, so it is a constant.
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