(Solved) : Changes Made Program Please Comment Top Line Changed Comment Changed Need Help Program Nee Q26782578 . . . .

Any changes that are made on the program pleasecomment on top of any line that changed and comment why was itchanged

I need help with this program. I need it to be able tosum strings and also when summing two decimal values, the resultmust be decimal as well. It does identify the tokens, basicallyreads them and implement them through mathematical calculations,but with strings it doesn’t work. C programs starts but once youinput a statement it explodes, but when u use a word withassignment in the entrance, everything else works,ADD,SUB,etc. Itall depends on what u input at the beginning of