C Program to Compare Two Strings Without Using strcmp Function

Problem:- Write A C++ Program To Compare Two String Are Equal Or Not Without Using Library Function or c++ program to compare two strings without using strcmp or C Program to Compare Two Strings without using strcmp function or C Program to Compare Two Strings Without Using strcmp or C program to compare two strings or How to compare two strings in c without using strcmp or Program to Compare Two Strings without using strcmp() in C++ or Write a program to compare two strings without using the strcmp() function or compare two strings without using strcmp in C++

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Logic:- In this problem, you can use two methods one is using library function secondly is without using a library function, but we use here without using a strcmp() function in this we first calculate the size of a both string and if the size of both strings is not equal then program print the message "Both strings are not equal" and if the size of both stings is equal then program compare both string character by character and return if both string is equal or not according to the string analysis. Below is both method for comparing a string using library function or without using library functions.

Using Library Function

strcmp(string1 ,string2)


Without Using Library Function

for(i=0,j=0;str1[i]!='\0',str2[j]!='\0';i++,j++)
{
if(str1[i]==str2[j])
{
flag=1;
}
else
{
flag=0;
}
}


This is a condition is used when the size of both strings is equal and we have to compare both the string character by character.


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Try Yourself - C++ Program To Check String Is Palindrome Or Not

Solution:-

#include<bits/stdc++.h>

using namespace std;

int main()

{

/*Visit - www.programmingwithbasics.com*/

   

    cout<<"=====================================";

    cout<<"\nVisit - www.programmingwithbasics.com";

    cout<<"\n=====================================";

    

  char str1[20],str2[20],i=0,j=0,flag=0;

  cout<<"\n\nEnter First String : \n";

  gets(str1);

  

  cout<<"Enter Second String : \n";

  gets(str2);

   

    while(str1[i]!='\0')

    {

    i++;

    }

   

    while(str2[j]!='\0')

    {

    j++;

    }

  

  if(i!=j)

  {

  flag=0;

  }

  

  else

  {

  for(i=0,j=0;str1[i]!='\0',str2[j]!='\0';i++,j++)

  {

  if(str1[i]==str2[j])

  {

  flag=1;

  }
   else
   {
   flag=0;

   }

  }

  }

  

  if(flag==0)

  {

  cout<<"Both Strings Are Not Equal\n";

  }

  else

  {

  cout<<"Both Strings Are Equal\n";

  }

  return 0;

}

Output:-

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