C program to compare two strings without using string functions

This is String comparing program using c. In which we compare two without using any predefined function.
We take two string value and compare these strings using the index value of each string.
For Example:
string1= hello and string2= hello
there is both string is form of array. now we will compare the index value of both string and check weather is it is equal or not?

ALGORITHM:-

step 1 : start
step 2 : Take two char array
step 3 : Input the string value in both array from user 
step 4 : Compare the [0]th zero index content of both array value until '\0'
step 5 : If [i]th values are not match of both array then return both are not equal
step 6 : If [i]th values are match of both array then return both are equal
step 7 : Exit

PROGRAM CODE:-

#include<stdio.h>
#include<stdio.h>

int comp(char[],char[]);
int main()
{
    char string1[100],string2[100];
    int c;

    printf("Enter first string in array: ");
    scanf("%s",string1);

    printf("Enter second string in array: ");
    scanf("%s",string2);

    c = comp(string1,string2);
    if(c == 1)
    {
         printf("Both are equal");
    }
    else
    {
         printf("Both are not equal");
    }
    return 0;
}
int comp(char string1[],char string2[])
{
    int i=0,temp=0;
    while(string1[i]!='\0' && string2[i]!='\0')
    {
         if(string1[i]!=string2[i])
         {
             temp=1;
             break;
         }
         i++;
    }

    if(temp==0 && string1[i]=='\0' && string2[i]=='\0')
    {
         return 1;
    }
    else
    {
         return 0;
    }
}

OUTPUT:-

Sample output:
Enter first string in array :- cprogrammingsimply
Enter second string in array :- cprogrammingsimply

Both are equal

C program to compare two string without using any funtion
Compare two string in c without predefined function
String comparison without any predefined function in c

Unknown Saturday, March 28, 2015

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About Author

SK Sitaram is a computer engineering. He has completed Advance Diploma in Software Engineering.
He is Founder and Developer of C Programming Simply. He loves researching in the IT field.
This is a part time blogger, Like a bathroom singer(:P) and He is Student of Jaipur National University. You can follow him in Twitter and find him in Facebook or Email him. Byeee (:P)

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