`P065.c`¶

Problem Statement

Write a program to reverse a string

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Beginner (index: 1 / 10)

Concepts¶

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Recursion
Array

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Source Code¶

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

void str_rev(char[]);

int main()
{
    char str[101];
    printf("Enter the string (Max: 100 Character): ");
    gets(str);
    printf("\nBefore Reverse: %s", str);
    str_rev(str);
    printf("\nAfter Reverse: %s", str);
    return 0;
}

void str_rev(char str[])
{
    int i, j;
    char temp;
    i = 0;
    j = strlen(str) - 1; // not taking the null
    while (i < j)
    {
        temp = str[i];
        str[i] = str[j];
        str[j] = temp;
        i++;
        j--;
    }
}

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 (P065.c):

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

    void str_rev(char[]);

    int main()
    {
        char str[101];
        printf("Enter the string (Max: 100 Character): ");
        gets(str);
        printf("\nBefore Reverse: %s", str);
        str_rev(str);
        printf("\nAfter Reverse: %s", str);
        return 0;
    }

    void str_rev(char str[])
    {
        int i, j;
        char temp;
        i = 0;
        j = strlen(str) - 1; // not taking the null
        while (i < j)
        {
            temp = str[i];
            str[i] = str[j];
            str[j] = temp;
            i++;
            j--;
        }
    }

P065.c¶