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int writeNum = 1; // support for boolean?
int fizz[] = "fizz";
int buzz[] = "buzz";

// copied from tests/string.c
void write_string(int[] s) {
    int i = 0;
    while(s[i] != 0) {
        write_char(s[i]);
        i = i + 1;
    }
}

// written myself
void write_number(int n) {
    if (n < 0) {
        write_char('-');
        n = -1 * n; // support for negative numbers? support for multiplication?
    }
    while (n != 0) { // until n is 0
        int c = n % 10; // get least significant digit, support for modulo?
        write_char('0' + c); // write it
        n = n - c; // and divide by 10 for the next round
        n = n / 10; // support for division?
    }
}

// for each number 0 to 100 inclusive:
// If number is divisible by 5 write "buzz"
// If number is divisible by 3 write "fizz"
// If number is divislbe by 3 or 5 write "fizzbuzz"
// otherwise write the number.
//
// for (int i = 0; i <= 100; i++)
// syntax copied from tests/for.c
// WTF, that is not C.
for(int i = 0; , i < 101, i = i + 1;) {
    writeNum = 1; // assume number should be printed
    if (i % 5 == 0) { // if divisible by 5?
        writeNum = 0;
        write_string(buzz);
    }
    if (i % 3 == 0) { // (also) divisibile by 3?
        writeNum = 0;
        write_string(fizz);
    }
    // if neither, print the number itself
    if (writeNum == 1) {
        write_number(i);
    }
    write_char('\n');
}