How to convert (Y/N) if-statement to assembly?

if (var1 == 'Y' || var1 == 'y') {
    var2 = 1;
    break;
}
else if (var1 == 'N' || var1 == 'n') {
    break;
    return 0;

This statement is for (Y/N). I'm pretty new to asm conversion so I really need some help. Thank you.