Class 10  W 2/13  Comp 110

Loops
   while  listing 4.1
   do-while  listing 4.2
   loop control variable
   4 parts of every loop
   infinite loop

   
   

loop control variable - variable in condition that
   determines number of times loop executes

4 parts of every loop
   initialization of loop control variable (and any
      other variables in the body of the loop)
   loop test (= condition) - decide if loop is to
      be executed
   update of loop control variable


In-class exercise

For each of the following
  i) identify the 4 parts of the loop
  ii) show the output of the code segment

a) int count = 0; // initialization
while( count < 5 ) {  // condition
   System.out.println(count);  // body
   count++;   // same as count = count + 1;  update
}
count 0,1,2,3,4,5
Output
0
1
2
3
4

b) int count = 0;
while( count < 5 ) {
   count++;
   System.out.print(count + " ");
}
count 0,1,2,3,4,5
Output
1 2 3 4 5


c) int count = 0;
while( count < 5 ) {
   System.out.println(count);
}


d) int count = 0;
do {
   System.out.println(count);
   count++;
} while( count < 0 );
System.out.println( "count after loop = " + count);

e) int count = 0;
while( count < 0 ) {
   System.out.println(count);
   count++;
} 
System.out.println( "count after loop = " + count);