There are following boolean operators supported by Java language.Assume variable A holds 10 and variable B holds 20, then −OperatorDescriptionExample== (equal to)Checks if the values of two operands are equal or not, if yes then condition becomes true.(A == B) is not true.!= (not equal to)Checks if the values of ... Read More

You need to use the following:You are missing spaces between ls_id+1. You can also use Add 1 to ls_idIn case you are using internal tables, you can directly use SY-TABIX and SY-Index depending upon whether the loop is nested or not.