integerinstruction.cpp

嵌入式Qt下的一个计算器源码

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#include "integerinstruction.h"

// Automatic type casting
Data *BaseIntegerInstruction::eval(Data *i) {
	integerNum = (IntegerData *)num;
	Data *ret = doEval((IntegerData *)i);
	return ret;
}

// Mathematical functions
Data * IntegerAdd::doEval(IntegerData *i) {
	i->set( integerNum->get() + i->get() );
	return i;
}
Data * IntegerSub::doEval(IntegerData *i) {
	i->set( i->get() - integerNum->get() );
	return i;
}
Data * IntegerMul::doEval(IntegerData *i) {
	i->set( i->get() * integerNum->get() );
	return i;
}
Data * IntegerDiv::doEval(IntegerData *i) {
	if (!integerNum->get()) {
                systemEngine->setError(eDivZero);
		qDebug("div by 0");
	} else
		integerNum->set( i->get() / integerNum->get() );
	return i;
}