Read a postfix expression from an input file. Evaluate the postfix format and display the results.

*****C LANGUAGE***** *****No classes / constructors/objects***** *****No Predefined classes from c++***** Precondition: The expression will be read from a file (input.txt) that contains a single line. There will be no spaces between the operands and the operators. The following operators are allowed: + - * / o The normal rules of precedence will apply. No error checking is necessary. The numbers will all be greater than 0 and less than 10 (positive, single digit numbers) Example: 12+ Result is 3