CIS241

System-Level Programming and Utilities

C Conditionals and Operations

Erik Fredericks, frederer@gvsu.edu
Fall 2025

Based on material provided by Erin Carrier, Austin Ferguson, and Katherine Bowers

Basic operators:

• Assignment: int x = 7;
• Arithmetic:
  • Basics: +, -, /, *
  • Modulo: % (Remainder)
  • Modified assignment (do op and store):
    • +=, -=, *=, /=, %=
  • Increment / decrement: ++, --

Boolean operators

• Comparison: ==, !=, >, <, >=, <=`

• Boolean operations:

  • Not: !
  • And: &&
  • Or: ||

• Note: These are different than Boolean operators:

  • Not (inverse): ~
  • Bitwise and: &
  • Bitwise or: |
  • Bitwise xor: ^

Control statements

if (expr)
{
    statement1;
}
else if (expr2)
{
    statement2;
}
else
{
    statement3;
}

// single line statements don't need braces
if (expr3) statement;

Ternary operator

expression ? expression1 : expression2

• if expression is true, replace with expression1
  else, replace with expression2

Order of operations

https://en.cppreference.com/w/c/language/operator_precedence