Decision making is anticipation of conditions occuring while execution of the program and specifying actions taken according to the conditions.
Decision structures evaluate multiple expressions which produce TRUE or FALSE as outcome. You need to determine which action to take and which statements to execute if TRUE or FALSE otherwise.
Following is the general form of a typical decision making structure found in most of the programming languages -
Python progamming language assumes any non - zero and non - null values as TRUE, and if it is either zero or null, then it is assumed as FALSE value.
Python programming language provides following types of decision making statements.
| S.NO. | STATEMENT | DESCRIPTION |
|---|---|---|
| 1. | if statements | An if statements consists of a boolean expression followed by one or more statements. |
| 2. | if...else statements | An if statement can be followed by an optional else statement, which executes when the boolean expression is FALSE. |
| 3. | nested if statements | You can use one if or elif (else if) statement inside another if or elif (else if) statement(s). |