[单选题]When does the actual calculation happen?什么时候进行实际的运算？PE8答案窝(daanwo.com)-大学生作业答案及考资分享平台
AEach time a new number is encountered每遇到一个新的操作数PE8答案窝(daanwo.com)-大学生作业答案及考资分享平台
BEach encounters a new operator每遇到一个新的操作符PE8答案窝(daanwo.com)-大学生作业答案及考资分享平台
CThe current operator has a higher priority than the operator on the top of the stack当前的操作符比栈顶的操作符优先级高PE8答案窝(daanwo.com)-大学生作业答案及考资分享平台
DThe current operator has a lower priority than the operator on the top of the stack当前的操作符比栈顶的操作符优先级低