pm.cpp

这是一个可以计算加减乘除的程序

#include <iostream.h>

int a, c, d;
char b;
class PM {
	int First() { cout << "输入一个算式:  "; }
	int cina() { cin >> a; }
	int cinb() { cin >> b; }
	int cinc() { cin >> c; }
	int compute() {
		if( b == '+' )
			d = a + c;
		else if( b == '-' )
			d = a - c;
		else if( b == '*' )
			d = a * c;
		else if( b == '/' )
			d = a / c;
		else
			cout << "运算符必须是加减乘除！再输入一个算式！";
		return (d);
	}
};

int main()
{
	PM pm;
	pm.First();
	pm.cina();
	pm.cinb();
	pm.cinc();
	pm.compute();
    while( b != '+' || b != '-' || b != '*' || b != '/' ) {
        pm.cina();
		pm.cinb();
		pm.cinc();
		pm.compute();
	}
}