Write a program to implement the algorithm for evaluating postfix expressions that involve only single-digit integers and the integer operations +, -, *, and /.  To trace the action of postfix evaluation, display each token as it is encountered, and display the action of each stack operation.  1. Each digit or operator should be separated by a space, and end with ':' character. 2. You should apply the stack ADT in the program.  3. You may need to use function is digit(int c) in standard header file #include   to check if the token character is a digit or not. 4. To convert the single-digit char c to the represented integer num, a simple method is to assign num by aChar - '0'

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