Print Hello World in C - HW #03

Team Krope September 16, 2024

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;
}