16_copy_user_def.c

// // Write a c program to copy one string into another using user-defined function.

// // Header Files
#include <stdio.h>
#include <conio.h>
#include <string.h>

#define ARRAY_SIZE 31

// // Function Declarations
char *copyString(char[], char[]);

// // Main Function Start
int main()
{
    char str[ARRAY_SIZE], copyStr[ARRAY_SIZE];

    printf("\nEnter Any String to Copy Make Its Copy (MAX CHARACTERS %d) => ", ARRAY_SIZE - 1);
    fgets(str, ARRAY_SIZE, stdin);  // // Input String
    str[strcspn(str, "\n")] = '\0'; // // Replace '\n' character with '\0' in str

    copyString(copyStr, str); // // copy str into copyStr using user-defined function

    printf("\nOriginal String => %s", str);
    printf("\nCopy of Entered String => %s", copyStr);

    putch('\n');
    getch();
    return 0;
}
// // Main Function End

// // Function Definitions 👇👇

// // Function to Copy One String into Another
char *copyString(char des[], char src[])
{
    // // Copy str into copy
    int i = 0;
    for (i = 0; src[i]; i++)
        des[i] = src[i];

    des[i] = '\0';

    return des;
}