C program to check given two string are equal or not

In this tutorial we are going to learn writing C program to check given two string are equal or not. There is multiple way to check this one.

In this tutorial we will learn two ways to do this. First we will see using the library function and second we will use own logic to compare.

How our string compare program will work?

• Our program will take two string as an input which we have to compare.
• We can directly compare with strcmp() function. It will return true if string match otherwise return false.
• Using while loop and if else we have built own logic to check the string equality.
• Here we are also considering uppercase and lowercase of the character.
• If two character of string are same but have different case then program will return it as not equal.

C program to check given two string are equal or not without using strcmp()

#include <stdio.h>
int main()
{
   char str1[256], str2[256],c;
   int temp=0,i=0;
   printf("C program to check given two string are same or not \n");
   printf("Enter the first string : ");
   scanf("%[^\n]%c",str1,&c);
   printf("Enter the second string : ");
   scanf("%[^\n]%c",str2,&c);
   while(str1[i]!='\0' && str2[i]!='\0')
    {
       if(str1[i]!=str2[i])
       {
           temp=1;
           break;
       }
       i++;
    }
   if(temp==0)
   printf("strings are same");
   else
   printf("strings are not same");
    return 0;
}

Output

C program to check given two string are same or not using strcmp()

#include <stdio.h>
#include <string.h>
int main()
{
   char str1[256], str2[256],c;
   int temp=0,i=0;
   printf("C program to check given two string are same or not \n");
   printf("Enter the first string : ");
   scanf("%[^\n]%c",str1,&c);
   printf("Enter the second string : ");
   scanf("%[^\n]%c",str2,&c);
   if (strcmp(str1, str2) == 0)
      printf("Strings are same\n");
   else
      printf("Strings are not same\n" );
   return 0;
}

Output

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