The conversation between human and AI assistant.
How do I write a simple C program to evaluate expressions?
No, I haven't. Can you explain how it works?
Absolutely! The shunting yard algorithm is a way to convert infix notation to postfix notation. It works by using a stack to keep track of operators and an output queue to hold the postfix notation. Here's how it works: for each token in the infix expression, if it's a number, add it to the output queue. If it's an operator, pop all operators with greater or equal precedence off the stack and add them to the output queue, then push the operator onto the stack. If it's a left parenthesis, push it onto the stack. If it's a right parenthesis, pop operators off the stack and add them to the output queue until you reach the corresponding left parenthesis. Once you've processed all the tokens, pop any remaining operators off the stack and add them to the output queue.