C++ Program to Compare Paths of Two Files

C++ Program to compare two string using pointers

Last Updated : 07 Sep, 2022

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.

C++ Program to Compare Paths of Two Files

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