CS136 Lecture Notes - Lecture 4: Semicolon, Mutation, Imperative Programming

• School: University of Waterloo
• Department: Computer Science
• Course: CS136
• Professor: Dave Tompkins

Document Summary

Void functions: only generate a side effect, and not return a value, return has no expression and its optional, declare that function returns nothing . // effects: displays a message void say_hello (void) { printf ( hello!\n ); return; Expression statements: an expression followed by a semicolon (;, printf is not a void function. Returns an int corresponding to the number of characters printed printf ( hello!\n ); ==> value = 7. The following example is a single block (compound statement) that contains a sequence of five expressions statements with the values of 9, 10, 11, 12, A sequence of statements: expression statements. For generating side effects: the only other type of statements are control flow statements. Control flow statements: change the flow of the program and the order in which other statements are executed. The if (and else) statements execute statements conditionally. 1university of waterloo, 03-imperative-c, p 31, snapshotted by author.