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    Experiment#9: Use of Nested If Else and Switch Statement Objective

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    Experiment#9: Use of Nested If Else and Switch Statement Objective

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    AbdullahJaved
    36 views4 pages

    Original Title

    LAB 09

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    Copyright:

    © All Rights Reserved
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    36 views4 pages

    Experiment#9: Use of Nested If Else and Switch Statement Objective

    Uploaded by

    AbdullahJaved

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    HITEC UNIVERSITY, TAXILA

    FACULTY OF ELECTRICAL ENGINEERING

    EE DEPARTMENT

    Experiment#9
    Use of nested if else and switch statement

    Objective
    An introduction with
    1. The use of switch statement for decision making among multiple paths.

    Software Tools
    1. Dev C++

    Theory
    C++ Program
    A computer program is a sequence of instructions that tell the computer what to do.

    Nested if....else statement


    The general form of a nested if...else statement is,
    if( expression )
    {
    if( expression1 )
    {
    statement-block1;
    }
    else
    {
    statement-block 2;
    }
    }
    else
    {
    statement-block 3;
    }
    if 'expression' is false the 'statement-block3' will be executed, otherwise it continues to perform
    the test for 'expression 1' . If the 'expression 1' is true the 'statement-block1' is executed otherwise
    'statement-block2' is executed.
    Example :
    void main( )
    {
    int a,b,c;
    Computer Fundamentals 1st Semester-EE HITEC UNI Taxila
    HITEC UNIVERSITY, TAXILA
    FACULTY OF ELECTRICAL ENGINEERING

    EE DEPARTMENT

    clrscr();
    cout << "enter 3 number";
    cin >> a >> b >> c;
    if(a > b)
    {
    if( a > c)
    {
    cout << "a is greatest";
    }
    else
    {
    cout << "c is greatest";
    }
    }
    else
    {
    if( b> c)
    {
    cout << "b is greatest";
    }
    else
    {
    cout <<"c is greatest";
    }
    }
    getch();
    }

    Switch statement
    If there are a number of decision making conditions instead of making an if..else construct, the
    programmer can use switch statement.

    The general syntax is:

    switch (expression)
    {
    case constant1:
    group of statements 1;
    break;
    case constant2:
    group of statements 2;
    break;
    .
    Computer Fundamentals 1st Semester-EE HITEC UNI Taxila
    HITEC UNIVERSITY, TAXILA
    FACULTY OF ELECTRICAL ENGINEERING

    EE DEPARTMENT

    .
    .
    default:
    default group of statements
    }
    In the above example, the expression is first evaluated and the value id checked with the
    constant1 in the case statement. If this is evaluated with the same value, then the group of
    statements is executed. When a break statement is encountered, the control is switched to the end
    of the switch statement. If the value of the expression is not equal to constant1, it is checked with
    constant2. If it evaluates the same value, then the group of statements (in the case of constant2) is
    executed. When a break statement is encountered, the control is then switched to the end of the
    switch statement. This proceeds until the value of expressions equal one of the constant values
    given. If the value of the expression is not equal to any of the constant values given, then, by
    default, the statements present are executed.

    Example
    void main()
    {
    int x;
    cout<<"Enter Input Value: ";
    cin>>x;
    switch(x)
    {
    case 10:
    cout<< "Value is 10";
    break;
    case 20:
    cout<<"Value is 20";
    break;
    default:
    cout<<"Invalid Input";
    }
    }

    Lab Tasks

    Computer Fundamentals 1st Semester-EE HITEC UNI Taxila


    HITEC UNIVERSITY, TAXILA
    FACULTY OF ELECTRICAL ENGINEERING

    EE DEPARTMENT

    1. Write a program that will arrange user given 3 input numbers in ascending and descending
    order using nested if else statement.
    2. Write a program that will arrange user given 4 input numbers in ascending and descending
    order using nested if else statement.
    3. Perform the task 1 and 2 using switch statement.

    Computer Fundamentals 1st Semester-EE HITEC UNI Taxila

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