%d: Signed decimal integers
    %s: String
    %c: Single character
    %b: Signed binary integers
    %o: Signed octal integers
    %x: Signed hex integers

int main (void)
{
    myPrintfC ("I'm, %d %s old", 21, "years");

    return 0;
}

sudo apt install nasm

nasm -f elf64 test.s -o test.o

gcc test1.o ... test2.o -o main

make