function readc() {
    const vm = this;
    readline(function (line) {
        if (!line[0]) throw "I/O Error: expecting a character.";

        vm.stack.push(line.charCodeAt(0));
        interpret.call(vm);
    });
    vm.pc++;
}
/**
 * Read an ASCII value from input and push it to stack.
 */
Read an ASCII value from input and push it to stack.
Read an ASCII value from input and push it to stack .
function readc() {
    const vm = this;
    readline(function (line) {
        if (!line[0]) throw "I/O Error: expecting a character.";
        vm.stack.push(line.charCodeAt(0));
        interpret.call(vm);
    });
    vm.pc++;
}
function readc ( ) { const vm = this ; readline ( function ( line ) { if ( ! line [ 0 ] ) throw "I/O Error: expecting a character." ; vm . stack . push ( line . charCodeAt ( 0 ) ) ; interpret . call ( vm ) ; } ) ; vm . pc ++ ; }
Read an ASCII value from input and push it to stack.
Read an ASCII value from input and push it to stack .