输入运算结果和操作数，然后该程序通过对操作数运算匹配，若雨运算结果相符则输出算术表达式，表达式的输出格式为1 +2 /3 +4=5,按从左至右顺序计算，目前只支持对+-*/这四类运算符的匹配-Enter the result of the operation and operands, then the program matches the number of operations by the operator, if the rain is consistent with the output arithmetic operation result expression, the expression of the output format is 1+2/3+4 = 5, according to the order from left to right calculations, currently only supported for+-*/operators of these four matches