learning-c/main.c

// Welcome to my journey of learning the fuckass language that is C

//importing basic modules
#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
    #include <conio.h>
    #define GETCH() _getch()
#else
    #include <termios.h>
    #include <unistd.h>
    char getch() {  // Fucking painful why is this piece of shit needed on UNIX Based/Unix-like systems 🫩
        struct termios oldt, newt;
        tcgetattr(STDIN_FILENO, &oldt);       // save old settings
        newt = oldt;
        newt.c_lflag &= ~(ICANON | ECHO);    // disable buffering and echo
        tcsetattr(STDIN_FILENO, TCSANOW, &newt); // apply new settings
        char ch67 = getchar();                       // read one char instantly
        tcsetattr(STDIN_FILENO, TCSANOW, &oldt); // restore old settings
        return ch67;
    }
    #define GETCH() getch()
#endif

// STRUCTURE TEST
struct man {
    char firstname[20];
    char surname[20];
    int age;
    int weight;
    char relationship_status[10];
};

// UNION TEST
union woman {
    int age;
    int weight;
};

// FUNCTION TEST
int multiply(int num_one, int num_two) {
    int result = num_one*num_two;
    return result;
}

// MAIN FUNCTION
int main() {
    // HELLO WORLD SECTION
    printf("HELLO WORLD BELOW:\n"); // DIVIDER
    char first[] = "Hello";
    char second[] = "World";
    printf("%s %s", first, second);

    // IF/ELSE STATEMENT
    printf("\n\nIF/ELSE STATEMENT BELOW:\n"); // DIVIDER
    int num = 67;
    if (69<num) {
        printf("69 is smaller than %d ", num);
    } else {
        printf("69 is larger than %d ", num);
    }

    // SWITCH STATEMENT
    printf("\n\nSWITCH STATEMENT BELOW:\n"); // DIVIDER
    int meme = 1337;
    switch (meme) {
        case 13:
            printf("she said she was twelve!");
            break;
        case 21:
            printf("haha 9+10");
            break;
        case 67:
            printf("lolol 67");
            break;
        case 69:
            printf("nice");
            break;
        case 420:
            printf("weed..");
            break;
        case 1337:
            printf("you are elite");
            break;
        case 80085:
            printf("do NOT put this number into a calculator");
            break;
        default:
            printf("Sorry I do not recognise this meme");
            break;
    }

    // WHILE LOOP
    printf("\n\nWHILE LOOP BELOW:\n"); // DIVIDER
    int a=1,b=7;
    while (a!=b) {
        a++;
        b-=1;
        printf("int a=%d AND int b=%d\n", a, b);
    }

    // FOR LOOP
    printf("\n\nFOR LOOP BELOW:\n"); // DIVIDER
    for (int i=0; i<=3; i++) {
        printf("i=%d\n", i);
    }

    // FUNCTION
    printf("\n\nFUNCTION (MULTIPLY) BELOW:\n"); // DIVIDER
    printf("%d * %d = %d", 5, 30, multiply(5,30));

    // ARRAY
    printf("\n\nARRAY BELOW:\n"); // DIVIDER
    int arr[] = {21, 67, 69, 420};
    printf("arr[0]=%d\narr[1]=%d\narr[2]=%d\narr[3]=%d", arr[0], arr[1], arr[2], arr[3]);

    // POINTER
    printf("\n\nPOINTER BELOW:\n"); // DIVIDER
    int victim=7;
    int *victim_pointer=&victim;
    printf("pointer of int victim is: %p\n", victim_pointer);
    int derefrencing_operator=*victim_pointer;
    printf("derefrencing operator of *victim_pointer is: %d\n", derefrencing_operator);
    int **double_ptr = &victim_pointer;
    printf("double pointer of the &victim_pointer is: %p", double_ptr);

    // STRING
    printf("\n\nSTRING BELOW:\n"); // DIVIDER
    char message[22]="Hello, world. Again...";
    printf("%s", message);

    // STRUCTURES
    printf("\n\nSTRUCTURE (man) BELOW:\n"); // DIVIDER
    struct man PETER={"Peter", "Griffin", 35, 150, "married"};
    printf("Our man is named %s %s, he is %d years old, he weights %dkg and his relationship status is %s.", PETER.firstname, PETER.surname, PETER.age, PETER.weight, PETER.relationship_status);

    // UNIONS
    printf("\n\nUNION (woman) BELOW:\n"); // DIVIDER
    union woman LOIS;
    LOIS.age = 34;
    LOIS.weight = 60;
    printf("Our woman is unknown, she is not %d years old and she weights %dkg. (LOIS.age and LOIS.weight).", LOIS.age, LOIS.weight);

    // PRESS ANY KEY TO CONTINUE
    printf("\n\nPress any key to continue...");
    GETCH();
    #ifdef _WIN32
        system("cls");
    #else
        system("clear");
    #endif

    // INPUT (BUT ONLY FOR ONE WORD! STOPS WHEN YOU PUT IN A SPACE)
    printf("\n\nINPUT BELOW:\n"); // DIVIDER
    char fruit[50]; //MAX 50 CHARACTERS
    printf("Pick a fruit (SINGLE WORD, EVERYTHING ELSE GETS IGNORED): ");
    fflush(stdout);   // this forces the buffer to print NOW, fixing the "bug" in which it prints out everything AFTER the next line (scanf)
    scanf("%s", fruit);
    printf("\nYou choose %s as your fruit!", fruit);

    // INPUT (LARGER AMOUNT OF WORDS COMPARED TO SCANF)
    printf("\n\nINPUT (larger) BELOW:\n"); // DIVIDER
    char vegetable[50];
    printf("Pick a vegetable to go in the salat: ");
    fflush(stdout); // same use case as above in the first input part of the code
    while (getchar() != '\n') {} // clears the input buffer so it doesnt print out excess input from the fruit one
    scanf(" %49[^\n]", vegetable); // the "[^\n]" means to read everything except a newline, which means you can input spaces inside now, 49 makes it so it doesnt crash once it has more than 50 characters
    printf("The %s will be a perfect choice for this salat!", vegetable);

    // END OF THE MAIN.C CODE, HERE YOU WILL BE ABLE TO CONTINUE ON TO OTHER EXPERIMENTS OF MINE
    printf("\n\nSWITCH OVER TO\n"); // DIVIDER
    printf("1 = DvorakMSDOS.C, 2 = exit\n");
    while (getchar() != '\n') {}  // same use case as above in the first input part of the code
    while (1==1) {
        fflush(stdout);  // same use case as above in the first input part of the code
        char chc = GETCH();
        if (chc == '1') {
            printf("placeholder");
        } else if (chc == '2') {
            return 0;
        } else {
            printf("invalid character, try again!\n");
        }
    }
}