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Ch-4.pdf
1.
Python Programming ing Problem
Solving Approach Reema Thareja 1 © OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 1
2.
© OXFORD UNIVERSITY
PRESS 2017. ALL RIGHTS RESERVED. 2 CHAPTER 4 Decision Control Statements
3.
© OXFORD UNIVERSITY
PRESS 2017. ALL RIGHTS RESERVED. 3 Control Statements A control statement is a statement that determines the control flow of a set of instructions, i.e., it decides the sequence in which the instructions in a program are to be executed. Types of Control Statements — • Sequential Control: A Python program is executed sequentially from the first line of the program to its last line. • Selection Control: To execute only a selected set of statements. • Iterative Control: To execute a set of statements repeatedly.
4.
If Statement © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 4 Example:
5.
If-Else Statement © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 5 Example:
6.
Nested if Statements ©
OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 6 A statement that contains other statements is called a compound statement. To perform more complex checks, if statements can be nested, that is, can be placed one inside the other. In such a case, the inner if statement is the statement part of the outer one. Nested if statements are used to check if more than one conditions are satisfied. Example:
7.
If-elif-else Statement © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 7 Python supports if-elif-else statements to test additional conditions apart from the initial test expression. The if-elif-else construct works in the same way as a usual if- else statement. If-elif-else construct is also known as nested-if construct. Example:
8.
While Loop © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 8 Example:
9.
For Loop © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 9 For loop provides a mechanism to repeat a task until a particular condition is True. It is usually known as a determinate or definite loop because the programmer knows exactly how many times the loop will repeat. The for...in statement is a looping statement used in Python to iterate over a sequence of objects.
10.
For Loop and
Range() Function © OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 10 The range() function is a built-in function in Python that is used to iterate over a sequence of numbers. The syntax of range() is range(beg, end, [step]) The range() produces a sequence of numbers starting with beg (inclusive) and ending with one less than the number end. The step argument is option (that is why it is placed in brackets). By default, every number in the range is incremented by 1 but we can specify a different increment using step. It can be both negative and positive, but not zero. Examples:
11.
Range() Function © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 11 If range() function is given a single argument, it produces an object with values from 0 to argument-1. For example: range(10) is equal to writing range(0, 10). • If range() is called with two arguments, it produces values from the first to the second. For example, range(0,10). • If range() has three arguments then the third argument specifies the interval of the sequence produced. In this case, the third argument must be an integer. For example, range(1,20,3). Examples:
12.
Condition-controlled and Counter-controlled
Loops © OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 12
13.
Nested Loops © OXFORD
UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 13 Python allows its users to have nested loops, that is, loops that can be placed inside other loops. Although this feature will work with any loop like while loop as well as for loop. A for loop can be used to control the number of times a particular set of statements will be executed. Another outer loop could be used to control the number of times that a whole loop is repeated. Loops should be properly indented to identify which statements are contained within each for statement. Example:
14.
The Break Statement ©
OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 14 The break statement is used to terminate the execution of the nearest enclosing loop in which it appears. The break statement is widely used with for loop and while loop. When compiler encounters a break statement, the control passes to the statement that follows the loop in which the break statement appears. Example:
15.
The Continue Statement ©
OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 15 Like the break statement, the continue statement can only appear in the body of a loop. When the compiler encounters a continue statement then the rest of the statements in the loop are skipped and the control is unconditionally transferred to the loop- continuation portion of the nearest enclosing loop. Example:
16.
The Pass Statement ©
OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 16 Pass statement is used when a statement is required syntactically but no command or code has to be executed. It specified a null operation or simply No Operation (NOP) statement. Nothing happens when the pass statement is executed. Difference between comment and pass statements In Python programming, pass is a null statement. The difference between a comment and pass statement is that while the interpreter ignores a comment entirely, pass is not ignored. Comment is not executed but pass statement is executed but nothing happens. Example:
17.
The Else Statement
Used With Loops © OXFORD UNIVERSITY PRESS 2017. ALL RIGHTS RESERVED. 17 Unlike C and C++, in Python you can have the else statement associated with a loop statements. If the else statement is used with a for loop, the else statement is executed when the loop has completed iterating. But when used with the while loop, the else statement is executed when the condition becomes false. Examples:
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