Task: Find the final value of given postfix expression. Example: Input: 1 123+*8- Output: -3 Here is the Code: Program in C++: #include <iostream> #include <bits/stdc++.h> using namespace std; int evalutionOfPostfix(string s) { stack<int> st; int a,b,c; for(int i=0;i<s.length();i++) { if(isdigit(s[i])) { st.push((s[i] - '0')); } else { b=st.top(); st.pop(); a=st.top(); st.pop(); if(s[i]=='*') { c=a*b; ...