②多种语言的case语句 var operator: char operand1, operand2, result: boolean case operator of result operandI and operand2 + result: -operandI or operand2 result: =operandI=operand2 end②多种语言的case语句 var operator:char; operand1,operand2,result:boolean; …… case operator of ‘.’:result:=operand1 and operand2; ‘+’:result:=operand1 or operand2; ‘=’:result:=operand1 = operand2; end