1. SELECTIONS STATEMENTS
lab3 PROGRAMMING 1
SELECTIONS STATEMENTS

2. BEFORE WE START Your Cell Phone Silent Please Keep Quite
Find Your Computer and Switch On
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3. content Boolean data types values. comparison operators .
selection statement .
conditional operator
Formatting Output .
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4. Boolean Data Type Boolean value: true or false. Example:
boolean open = true;
How do you compare two values, such as whether is greater than 0, equal to 0, or less
than 0?
The result of the comparison is a Boolean value.
java provides six comparison operators (also known as relational operators), show in Table
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5. comparison AND logic operators
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6. Selection statements Selection statements use conditions.
Conditions are Boolean expressions .
Java has several types of selection statements:
one-way if statements.
two-way if statements.
nested if statements.
switch statements.
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7. One-Way if Statements
A one-way if statement executes an action if and only if the condition is true.
The syntax for a one-way if statement is shown below:
if (boolean-expression) {
statement(s); }
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8. Two-Way if Statements
The actions that a two-way if statement specifies differ based on whether the condition is true or false.
The syntax for a two-way if statement is shown below:
if (boolean-expression) {
statement(s)-for-the-true-case; }
else {
statement(s)-for-the-false-case;
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9. Two-Way if Statements(cont..)
Example :
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10. Nested if Statements
The inner if statement is said to be nested inside the outer if statement.
multiple alternative if statements.
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11. Switch Statements
Java provides a switch statement to handle multiple conditions efficiently.
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12. Example :Switch statements
int month = 8;
switch (month) {
case 1: System.out.print("January"); break;
case 2: System.out.print("February"); break;
case 3: System.out.print("March"); break;
case 4: System.out.print("April"); break;
case 5: System.out.print("May"); break;
case 6: System.out.print("June"); break;
case 7: System.out.print("July"); break;
case 8: System.out.print("August"); break;
case 9: System.out.print("September"); break;
case 10: System.out.print("October"); break;
case 11: System.out.print("November"); break;
case 12: System.out.print("December"); break;
default: }
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13. conditional operator The syntax is shown below:
boolean-expression ? expression1 : expression2;
The result of this conditional expression is expression1 if boolean-expression is true;
otherwise the result is expression2.
For example:
if (num % 2 == 0)
System.out.println(num + “is even”);
else
System.out.println(num + “is odd”);
System.out.println((num % 2 == 0)? num + “is even” :num + “is odd”);
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14. Formatting Output Use the printf statement.
System.out.printf(format, items);
Where format is a string that may consist of substrings and format specifiers.
A format specifier specifies how an item should be displayed.
An item may be a numeric value, character, boolean value, or a string.
Each specifier begins with a percent sign.
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15. Specifier Output Example
%b a boolean value true or false
%c a character 'a'
%d a decimal integer
%f a floating-point number
%e a number in standard scientific notation e+01
%s a string "Java is cool"
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16. Exercise1
Write a program that prompts the user to enter an integer and checks
whether the number is divisible by both 5 and 6, or neither of them, or just one of them. 1 2 3 4
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17. OUTPUT
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18. Exercise2
Write a program to make simple calculator , Let the user Enter the numbers then ,choose the Arithmetic operation.
1] Addition
2]Subtraction
3]Multiplication
4]Division 1 2 3
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19. Exercise2
Add
Sub
Mul
Div
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20. OUTPUT
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21. Thank You !