btoi(a) {bool int}
Converts the boolean values t and f into 1 and 0,
respectively.
code_char(a) {int char}
Converts an integer to a character. The integer must be the
code for a valid character.
char_code(a) {char int}
Converts a character to its integer code.
float(v) {int float}
Converts an integer to a floating-point number.
ceil(v) {float int}
Converts a floating-point number to an integer by truncating toward
positive infinity.
floor(v) {float int}
Converts a floating-point number to an integer by truncating toward
negative infinity.
trunc(v) {float int}
Converts a floating-point number to an integer by truncating toward zero.
round(v) {float int}
Converts a floating-point number to an integer by rounding to the
nearest integer; if the number is exactly halfway between two integers,
then it is implementation specific to which integer it is rounded.