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C program to compare two strings using pointers

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mahmoud2506
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2022-05-03
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C program to compare two strings using pointers

Learn: How to compare two strings using pointers in C programming language?

Here, you will learn how to read and compare two strings using pointers in C programming language? In this program, we are taking two strings with maximum number of characters (100) MAX using pointers and comparing the strings character by characters.

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mahmoud2506
2022-05-03
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Program to compare two strings using pointers in C

#include <stdio.h>

//Macro for maximum number of characters in a string
#define MAX 100

int main()
{
	//declare string variables
	char str1[MAX]={0};
	char str2[MAX]={0};
	
	int loop;	//loop counter
	int flag=1;
	
	//declare & initialize pointer variables
	char *pStr1=str1;
	char *pStr2=str2;
	
	//read strings 
	printf("Enter string 1: ");	
	scanf("%[^\n]s",pStr1);
	printf("Enter string 2: ");	
	getchar(); //read & ignore extra character
	scanf("%[^\n]s",pStr2);	
	
	//print strings
	printf("string1: %s\nstring2: %s\n",pStr1,pStr2);
	
	//comparing strings
	for(loop=0; (*(pStr1+loop))!='\0'; loop++)
	{
		if(*(pStr1+loop) != *(pStr2+loop))
		{
			flag=0;
			break;
		}
	}
	
	if(flag)
		printf("Strings are same.\n");
	else
		printf("Strings are not same.\n");
	
	return 0;	
}

Output

First run:
Enter string 1: IncludeHelp.com 
Enter string 2: Include.com 
string1: IncludeHelp.com
string2: Include.com
Strings are not same.

Second run:
Enter string 1: includehelp.com 
Enter string 2: includehelp.com 
string1: includehelp.com
string2: includehelp.com
Strings are same.

Here, flag is a variable that is assigned by 1 initially, within the loop if any character of first string is not equal to character of second string, and then value of flag will be 0 (loop will be terminated). At the end, we will check if flag is 1, strings are same else strings are not same.

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