C Program To Compare Two Strings With/Without Using strcmp() Function.

C Program To Compare Two Strings Using strcmp Function

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

int main()
{
    char a[100], b[100];

    printf("Enter the first string\n");
    gets(a);

    printf("Enter the second string\n");
    gets(b);

    if (strcmp(a,b) == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;
}


OUTPUT:

Enter the first string
Compare
Enter the second string
Compare
Entered strings are equal.



C Program To Compare Two Strings Without Using strcmp Function

#include <stdio.h>

int compare_strings(char [], char []);

int main()
{
    int flag;
    char a[1000], b[1000];

    printf("Input first string\n");
    gets(a);

    printf("Input second string\n");
    gets(b);

    flag = compare_strings(a, b);

    if (flag == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;
}

int compare_strings(char a[], char b[])
{
    int c = 0;

    while (a[c] == b[c]) {
        if (a[c] == '\0' || b[c] == '\0')
            break;
        c++;
    }

    if (a[c] == '\0' && b[c] == '\0')
        return 0;
    else
        return -1;
}

OUTPUT:

Input first string
ComparingStrings
Input second string
ComparingStrings
Entered strings are equal.

C Program To Compare Two Strings Using Pointers

#include <stdio.h>

int compare_string(char*, char*);

int main()
{
    char first[1000], second[1000], result;

    printf("Input first string\n");
    gets(first);

    printf("Input second string\n");
    gets(second);

    result = compare_string(first, second);

    if (result == 0)
        printf("Both strings are same.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;
}

int compare_string(char *first, char *second) {
    while (*first == *second) {
        if (*first == '\0' || *second == '\0')
            break;

        first++;
        second++;
    }

    if (*first == '\0' && *second == '\0')
        return 0;
    else
        return -1;
}

OUTPUT:

Input first string
CholbeNaa
Input second string
Cholbe
Entered strings are not equal.

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