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17
it114105/itp3914/Lab07/Ex10.java Normal file
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import java.util.Scanner;
public class Ex10 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("How many values to enter? ");
int size = input.nextInt();
double sum = 0.0;
for(int i = 0; i < size; i++){
System.out.print("Value? ");
sum += input.nextDouble();
}
System.out.println("Average = " + sum/size);
}
}

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it114105/itp3914/Lab07/Ex11.java Normal file
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import java.util.Scanner;
public class Ex11 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
double sum = 0;
int count = 0;
while(true){
System.out.print("Value? ");
double value = input.nextDouble();
if(value == 0)
break;
sum+=value;
count++;
}
System.out.println("Average = " + sum/count);
}
}

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it114105/itp3914/Lab07/Ex12.java Normal file
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import java.util.Scanner;
public class Ex12 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int numOfOdd=0, numOfEven=0;
for (int i = 0; i < 5; i++) {
System.out.print("Value? ");
int value = input.nextInt();
if(value % 2 == 0)
numOfEven++;
else
numOfOdd++;
}
System.out.println("Number of odd values = " + numOfOdd);
System.out.println("Number of even values = " + numOfEven);
}
}

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it114105/itp3914/Lab07/Ex6a.java Normal file
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public class Ex6a {
public static void main(String[] args) {
// (a)
int i = -9;
while( i <= -1){
System.out.println(i);
i+=3;
}
System.out.println("After loop, i=" + i);
}
}

13
it114105/itp3914/Lab07/Ex6b.java Normal file
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public class Ex6b {
public static void main(String[] args) {
// (b)
int i = 5;
System.out.println(i--);
while ( i >= 0){
System.out.println(i--);
}
System.out.println("After loop, i=" + i);
}
}

12
it114105/itp3914/Lab07/Ex7.java Normal file
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import java.util.Scanner;
public class Ex7 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Number of stars? ");
int num = input.nextInt();
for(int i = 0; i < num; i++){
System.out.print("*");
}
}
}

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it114105/itp3914/Lab07/Ex8.java Normal file
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import java.util.Scanner;
public class Ex8 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("n? ");
int num = input.nextInt();
int result = 1;
for(int i=num; i > 0; i--)
result*=i;
System.out.printf("%d! = %d\n", num, result);
}
}

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it114105/itp3914/Lab07/Ex9.java Normal file
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import java.util.Scanner;
public class Ex9 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("n? ");
int num = input.nextInt();
int result = 1;
for(int i=num; i > 0; i--){
System.out.printf("%d ", i);
if(i != 1)
System.out.print("x ");
else
System.out.print("= ");
result*=i;
}
System.out.println(result);
}
}

249
it114105/itp3914/Lab07/README.md.original Normal file
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# Lab 7 Repetition Part 1
## Topic 3: Basic Program Structures
### Intended Learning Outcomes
Upon completion of this tutorial/lab, you should be able to:
- Use loops to perform searching on a text string.
- Use different types of loops to calculate sum of series.
## Exercise 1
Determine the output of the following Java programs.
(a)
```java
public static void main( String[] args ) {
double balance = 1000; // initialize to $1000
double interestRate = 0.1;
int years = 0; // number of years
do {
balance = ( 1 + interestRate ) * balance;
years += 1;
} while ( balance <= 1200 );
System.out.println( years );
}
// Output:
2
```
(b)
```java
public static void main( String[] args ) {
int j = 2;
String s = "";
while ( j <= 8 ) {
s += "*";
j += 2;
}
System.out.println( j + " " + s );
}
// Output:
10 ****
```
(c)
```java
public static void main( String[] args ) {
int i;
for ( i=-9; i<=-1; i+=3 )
System.out.print( i + " " );
}
// Output:
-9 -6 -3
```
## Exercise 2
Identify and correct the error(s) in the program fragment below.
(a)
```java
int c=0, product=1;
while (c <= 5) {
product *= c;
++c;
```
Logic error:
The variable product is always 0 after each loop, thus the loop is having no use.
Having a syntactically correct program doesn't mean that your program is producing the
correct result.
(b)
```java
int x=1, total;
While (x <= 10) {
total += x;
x++;
}
```
Syntax error: While should be while.
Better: Although Java initializes numerical variables to 0 automatically if an initial value is
not specified during variable declaration, it is better to write explicitly total=0 for better
program readability.
(c)
```java
For (int x=100, x >= 1, x++);
System.out.println(x);
```
Syntax error: for (int x=100; x >= 1; x++)
Logic error: x will always be greater than 1 and the loop will never terminate.
Having a syntactically correct program doesn&#39;t mean that your program is producing the
correct result.
## Exercise 3
What will be the value of variable $x$ after executing the following program fragment?
```java
int x=1, y=9;
for (int i=0; i<y; i+=3)
x++;
# x is 4
```
## Exercise 4
What will be printed by the program fragments below?
(a)
```java
int x=12;
do {
System.out.print(x + " ");
x--;
} while (x > 7);
// Output:
12 11 10 9 8
```
(b)
```java
for (int i=10; i<=25; i+=5)
System.out.print( (i/5) + " ")
// Output:
2 3 4 5
```
## Exercise 5
What will be printed by the program below?
```java
public class Question {
public static void main(String [] args) {
int y, x=1, total=0;
while (x <= 5) {
y = x * x;
System.out.println(y);
total += y;
x++;
}
System.out.println("Total is " + total);
}
}
// Output:
1
4
9
16
25
Total is 55
```
## Exercise 6
Rewrite the following programs with while loops.
(a)
```java
public static void main( String[] args ) {
int i;
for ( i=-9; i<=-1; i+=3 )
System.out.println( i );
System.out.println( "After loop, i=" + i );
}
```
(b)
```java
public static void main( String[] args ) {
int i = 5;
do {
System.out.println(i--);
} while ( i >= 0 );
System.out.println( "After loop, i=" + i ); }
```
## Exercise 7
Write a program to ask the user to input an int value. The program then prints the corresponding number of ‘*’ on screen.
Shown below are two sample executions of the program. Those in underline are user inputs.
```
e:\> java Ex7
Number of stars? _5_
****
```
```
e:\> java Ex7
Number of stars? _9_
*********
```
## Exercise 8
Write a program to calculate n! where n is an integer value entered by the user.
NOTE: $n! = n (n-1) \times (n-2) \times (n-3) \times …\times 1$
For example, $5!=5\times 5\times 4\times 3\times 2\times 1$
Shown below are two sample executions of the program. Those in __ are user inputs.
```
e:\> java Ex8
n? _3_
3! = 6
```
```
e:\> java Ex8
n? _6_
6! = 720
```
## Exercise 9
Rewrite your program in Exercise 8 so that the output becomes:
```
e:\> java Ex9
n? _3_
3 x 2 x 1 = 6
```
```
e:\> java Ex9
n? _6_
6 x 5 x 4 x 3 x 2 x 1 = 720
```
## Exercise 10
Write a program to perform the followings:
- Ask the user the number of values to enter
- Read the values from the user
- Calculate and print the average of the values.
Shown below is a sample execution of the program. Those in __ are user inputs.
```
e:\> java Ex10
How many values to enter? _4_
Value? _10_
Value? _24_
Value? _20_
Value? _9_
Average = 15.75
```