`P068.c`¶

Problem Statement

Write a c program that perform the operation of strcmp()

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Beginner (index: 2 / 10)

Concepts¶

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Pointers
Recursion
Array
Iteration

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Source Code¶

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

int string_compare1(char s1[], char s2[])
{
    int i, c, cmp = 0, p = 0;
    i = 0;
    while (s1[i] != '\0' && s2[i] != '\0')
    {
        if (s1[i] != s2[i])
        {
            cmp = s1[i] - s2[i];
            p = 1;
            break;
        }
        i++;
    }
    c = s1[i] != '\0' ? s1[i] : (-1) * s2[i];
    return p == 1 ? cmp : c;
}
int string_compare2(char *s1, char *s2)
{
    while (*s1 != '\0' && (*s1 == *s2))
    {
        s1++;
        s2++;
    }
    return *s1 - *s2;
}

int main()
{
    char str1[] = "AMIT";
    char str2[] = "Amit";
    printf("Result 1 = %d", string_compare1(str1, str2));
    printf("\nResult 2 = %d", string_compare2(str1, str2));
    return 0;
}

Explanation¶

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (P068.c):

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

    int string_compare1(char s1[], char s2[])
    {
        int i, c, cmp = 0, p = 0;
        i = 0;
        while (s1[i] != '\0' && s2[i] != '\0')
        {
            if (s1[i] != s2[i])
            {
                cmp = s1[i] - s2[i];
                p = 1;
                break;
            }
            i++;
        }
        c = s1[i] != '\0' ? s1[i] : (-1) * s2[i];
        return p == 1 ? cmp : c;
    }
    int string_compare2(char *s1, char *s2)
    {
        while (*s1 != '\0' && (*s1 == *s2))
        {
            s1++;
            s2++;
        }
        return *s1 - *s2;
    }

    int main()
    {
        char str1[] = "AMIT";
        char str2[] = "Amit";
        printf("Result 1 = %d", string_compare1(str1, str2));
        printf("\nResult 2 = %d", string_compare2(str1, str2));
        return 0;
    }

P068.c¶