Error occurs in C

[C++]

1. Introduction 2. Beginner Errors 2.1 Forgetting to put a break in a switch statement 2.2 Using = instead of == 2.3 scanf() errors 2.3.1 Forgetting to put an ampersand (&) on arguments 2.3.2 Using the wrong format for operand 2.4 Size of arrays 2.5 Integer division