Bing found the following results
Arithmetic evaluation - Rosetta Code
Tree Traversal Techniques - Data Structure and Algorithm Tutorials …
Scheme Infix Expression Evaluation for Students | Course Hero
Problem 10966 - National Tsing Hua University
Three address code in Compiler - GeeksforGeeks
Problem 10968 - National Tsing Hua University
Appendix A: Operator Precedence in Java - Princeton University
Chapter 6 Functions | Advanced R Exercises
Kotlin Infix Function Calls - Tutcoach
Teach Yourself Scheme in Fixnum Days - GitHub Pages