Infix expression to suffix expression

(1) First determine the expression expression A The order of operations , Then add brackets ：((1 + (( 2 + 3)* 4 )） – 5 ）

(2) Start with the innermost bracket , The conversion method to suffix expression is ：（ Ignore brackets ） The number is in front , The sign is after .

1）( 2 + 3) => 23+

2) (( 2 + 3)* 4 ) => 23+4*

3) （1 + (( 2 + 3)* 4 )）=> 123+4*+ [ In order of operation , From left to right ]

4）((1 + (( 2 + 3)* 4 )） – 5 ）=> 123+4*+ 5-

The suffix expression is ：12 3 + 4 * + 5 –