Print Hello World in C - HW #03

Here are the possible ways.

#include <stdio.h>

#include <unistd.h>

int main() {

    printf("Hello World!\n");

    // 1. Using Standard `printf` Function

    printf("Hello World!\n");

    // 2. Using `puts` Function

    puts("Hello World!");

    // 3. Using `write` System Call (Unix/Linux)

    write(1, "Hello World!\n", 13);

    // 4. Without Using Standard Library (Minimalist)

    const char msg[] = "Hello World!\n";

    for (int i = 0; msg[i] != '\0'; i++) {

        putchar(msg[i]);

    }

    // 5. Using Function Pointer to `printf`

    void (*print)(const char *, ...) = printf;

    print("Hello World!\n");

    // 6. Using Recursion

    void printHello(int n) {

        if (n == 0) return;

        printf("Hello World!\n");

    }

    printHello(1);

    // 7. Printing `Hello World!` Character by Character

    char str[] = "Hello World!";

    for(int i = 0; str[i] != '\0'; i++) {

        putchar(str[i]);

    }

    putchar('\n');

    // 8. Using Array of Function Pointers

    void hello() {

        printf("Hello World!\n");

    }

    void (*funcs[1])() = { hello };

    funcs[0]();

    return 0;

}

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