栈的应用：表达式求值的设计
}
if (!PrintError){ answer = FTop(Operands); FPop(Operands); if (FIsEmpty(Operands) != 1){ fprintf(Change,\ /*如果还有操作数*/ PrintError = 0; } else fprintf(Change,\ }
else{ fprintf(Change,\ PrintError = 0; }
FMakeEmpty(Operands); free(Operands);
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