SELF STUDY IF STATEMENTS SELECTION STRUCTURE if selection

SELF STUDY

IF STATEMENTS

SELECTION STRUCTURE if selection statement if…else selection statement switch selection statement

EXAMPLE Write a program that reads a student’s grade and prints “passed” if the grade is greater than or equal 60. Flowchart: Code: . . . if ( grade >= 60 ) System. out. print("Passed”); . . .

ONE-WAY SELECTION Example: char grade=‘’ if ( score >= 90 ) 5 grade = ‘A’;

EXAMPLE IF-STATEMENT: FIND ABSOLUTE VALUE import java. util. Scanner; public class If 1 { public static void main(String[] args) { Scanner in = new Scanner(System. in); int a; System. out. print("Enter an integer value: "); a = in. next. Int(); if ( a < 0 ) a = -a; // Read in an integer from keyboard // If-statement // Negate a ONLY if a < 0 System. out. print("It's absolute value = "); System. out. println(a); } }

TWO-WAY SELECTION Syntax: if (expression) statement 1; else statement 2; else statement must be paired with an if. 7

TWO-WAY SELECTION 8 Example: boolean positive, negative; if (number >= 0 ) positive = true; else //number < 0 negative =true;

MULTIPLE SELECTION: NESTED IF Example 4_23 : if ( GPA >= 2. 0 ) if (GPA >= 3. 9) System. out. println(“Dean Honor list”); else System. out. println(“GPA below graduation requirement”); If GPA = 3. 8 what will be printed? 9 GPA below graduation requirement

MULTIPLE SELECTION: NESTED IF Example 4_23 : (rewritten) if ( GPA >= 2. 0 ) { if (GPA >= 3. 9) System. out. println(“Dean Honor list”); } else System. out. println(“GPA below graduation requirement”); Now, if GPA = 3. 8 what will be printed? 10

public class Test { public static void main(String args[]){ int x = 30; if( x == 10 ){ System. out. print("Value of X is 10"); } else if( x == 20 ){ System. out. print("Value of X is 20"); } else if( x == 30 ){ System. out. print("Value of X is 30"); } else{ System. out. print("This is else statement"); } } }

EXERCISE What is the output for the following code lines if hours=35 and hours=60: a) if (hours <= 40) System. out. println(“No overtime” ); System. out. println(“ You must work over 40 hours for overtimen”); System. out. println(“Continue” ); B) if (hours <= 40) { cout << “No overtime” << endl; cout << "You must work over 40 hours for overtime. n"; } cout << “Continue” << endl;