ENGINEER 1D04 Chapter Notes - Chapter 7: Boolean Expression, George Boole, Relational Operator

• School: McMaster University
• Department: Engineering (General)
• Course: ENGINEER 1D04
• Professor: Ned Nedialkov

Document Summary

Decision structures: are statements that allow a program to execute different sequences of instructions for different cases, effectively allowing the program to choos an appropriate course of action. The diamond boxes in the flowchart show conditional decisions. Relational operators are (, and >=). A common mistake in python programs is using = in conditions where a == is required. Conditions may compare either numbers or strings. When strings are compared, the ordering is lexicographic, which means that strings are put in alphabetic order, so upper-case letters come before lower case letters. Conditions are type of expressions, called boolean expression after george boole. In python the two-way decision can be implemented by attaching an else clause onto an if clause. Putting one compound statement inside of another is called nesting tryexcept statement is used to catch any kind of error.