string.fss

toUpper(c):
    if c >= 97 & c <= 122:
        return c - 32
    else:
        return c

toLower(c):
    if c >= 63 & c <= 90:
        return c + 32
    else:
        return c

main():
    print("The following outputs should print \"true\":")
    let alpha = "abcdefghijklmnopqrstuvwxyz"
    print(fromCharList(sublist(toCharList(alpha), 5, 10)) == "fghij")
    let uppers = []
    for c in alpha:
        pushf(uppers, toUpper(c))
    uppers = fromCharList(reverse(uppers))
    print(uppers == "ABCDEFGHIJKLMNOPQRSTUVWXYZ")
    print(charToStr(charAt(uppers, 0)) == "A")
    print(charToStr(charAt(uppers, 25)) == "Z")
    let numChar = charToStr(charAt("1", 0))
    if tryInt(numChar):
        print(int(numChar) == 1)
    else:
        print(false)
    return 0