3.2 Using the numberio Fragment

A program using the numberio fragment will have the following structure:

INCLUDE '~beta/basiclib/numberio --- program: descriptor --- (# ... r: @real; do ... getReal -> r; ... #)

3.2.1 Reading numbers from standard input

The following example illustrates using numberio to read general numerics, as well as based, integer and reals from keyboard.

Program 2: NumberioDemo.bet

ORIGIN '~beta/basiclib/numberio'; --- program: descriptor --- (# do L: (# do 'Enter a general number: '->puttext; getNumber (# valueError::< (# do msg[]->screen.putline; true->continue #); syntaxError::< (# do msg[]->screen.putline; get; true->continue #); baseError::< (# do msg[]->screen.putline; true->continue #); integerValue::< (# do '\tInteger='->puttext; value->putInt #); basedValue::< (# do '\tBase='->puttext; base->putint; ' Value='->puttext; value->putInt; ' BasedValue='->puttext; (base,value)->putBased; #); realValue::< (# do '\tReal='->puttext; value->screen.putReal(# format::< (# do exp->style; true->upcase #) #) #); do newline; #); 'Enter a based number: '->puttext; getBased (# valueError::< (# do msg[]->screen.putline; true->continue #); syntaxError::< (# do msg[]->screen.putline; true->continue #); baseError::< (# do msg[]->screen.putline; true->continue #); do '\tBase='->puttext; b->putint; ' Value='->puttext; i->putInt; ' BasedValue='->puttext; (b,i)->putBased; #); newline; 'Enter a real number: '->puttext; getReal (# valueError::< (# do msg[]->screen.putline; true->continue #); syntaxError::< (# do msg[]->screen.putline; true->continue #); baseError::< (# do msg[]->screen.putline; true->continue #); do '\tReal='->puttext #)->screen.putreal(# format::< (# do exp->style; true->upcase #) #); newline; 'Enter an integer number: '->puttext; getInteger (# valueError::< (# do msg[]->screen.putline; true->continue #); syntaxError::< (# do msg[]->screen.putline; true->continue #); baseError::< (# do msg[]->screen.putline; true->continue #); do '\tInteger='->puttext #)->putInt; newline; restart L #) #)