Shift reduce parser performs two main operations;

1. Shift
2. Reduce

What is Shift?

Shift operation is used in shift-reduce parsing to push the current input symbol to the stack.

What is reduce?

Reduce operation is used in shift-reduce parsing to replace the symbols with non-terminal.

Example of Shift reduce parsing

Let’s begin with an example of CFG (Context-free grammar).

E-> E+E

E->0

E->1