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JAVA – Programming Language
RHHS – SE2
Problem 1
What are the outputs of the following program?
int a; int b; int c; String name;
a=10;b=20;
System.out.print("The value of a is " + a);
System.out.println(" The value of b is " + b);
c=a+b;
System.out.println(c);
a=a*2;
c=a+b;
System.out.print(a);
System.out.println(c);
name="java";
System.out.println(name);
name="End";
System.out.println(name);
Solution
The value of a is 10
The value of b is 20
30
20
40
Java
end
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 2
Write a java program that calculates the area, and the perimeter of a circle. The radius of
the circle is equal to 10.
The output of the program should appear as the following form
Area and Perimeter
-----------------Radius = 10
Area
= 314
Perimeter = 62.8
Solution
double a,p;
int r=10;
System.out.println("Area and perimeter");
System.out.println("------------------");
System.out.println("Radius = " + r);
a=3.14*r*r;
System.out.println("Area = " + a);
p=2*3.14*r;
System.out.println("Perimeter = " + p);
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 3
What are the outputs of the following program?
int a; int b; int c; String K;
a=5;
b=a+10;
c=1;
System.out.println("a = " + a);
System.out.println("b = " + b);
c=a;
c=c*3;
System.out.print(c);
a=a*a;
c=1;
a=c;
System.out.println(a);
K="K";
K="Stop";
System.out.println(K);
Solution
a=5
b = 15
15
1
stop
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 4
Write a java program that calculates the average mark of the student Cynthia Al-zein.
Take into consideration: Exam1 = 80, Exam2=90
The output of the program should appear as the following form:
FName: Cynthia Lname: Al-zein
Exam1: 80 Exam2: 90
The average of CynthiaAl-zein is 85.0
Use the following variables: String fn, ln
Int exam1, exam2
Double avg;
String fn,ln;
int exam1, exam2;
double avg;
System.out.print("First name : ");
fn=scan.next();
System.out.print("Last name : ");
ln=scan.next();
System.out.print("Exam 1 : ");
exam1=scan.nextInt();
System.out.print("Exam 2 : ");
exam2=scan.nextInt();
avg=(exam1+exam2)/2;
System.out.println("The average of " + fn + " " + ln + " is " + avg);
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 5
Write a java program that calculates the Square of an integer number.
The number is given by the user.
The output of the program should appear as the following form
Enter a number: 10
The square number of 10 is 100
int a,s;
System.out.println("Enter a number : ");
a=scan.nextInt();
s=a*a;
System.out.println("The square number of " + a + " is " + s);
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 6
Write a java program that calculates the area and the perimeter of a rectangle.
The width and the height are given by the user.
The output of the program should appear as the following form
Area - Perimeter of a Rectangle
------------------------------Enter the width : 10
Enter the Height : 20
Area = 200
Perimeter = 60
Solution :
int w,h,a,p;
System.out.println("Area - Perimeter of a Rectangle ");
System.out.println("------------------------------- ");
System.out.print("Enter the width : ");
w=scan.nextInt();
System.out.print("Enter the height : ");
h=scan.nextInt();
a=w*h;
p=(w+h)*2;
System.out.println("Area = " + a);
System.out.println("Perimeter = " + p);
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 7
Write a java program that calculates the following operations as the following form:
First and second numbers are given by the user.
The output of the program should appear as the following form
Enter the first number: 10
Enter the second number: 4
10 + 4 = 14.0
10 * 4 = 40.0
10 / 4 = 2.5
Solution
Int a,b,s,m;
double d;
System.out.print(“enter the first number:”);
a=scan.nextInt();
System.out.print(“enter the second number:”);
b=scan.nextInt();
s=a+b;
m=a*b;
d=a/b;
System.out.println(a + “ + ” + b + “ = “ + s);
System.out.println(a + “ * ” + b + “ = “ + m);
System.out.println(a + “ / ” + b + “ = “ + d);
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 8
Write a java that calculates the absolute value of a given number.
The output of the program should appear as the following form
Enter a number: -5
The absolute value of -5 is 5
Solution
int a;
System.out.print("Enter a number : ");
a=scan.nextInt();
if(a>0) {
System.out.println("The absolute value of " + a + " is " + a);
}
else {
System.out.println("The absolute value of " + a + " is " + (-a));
}
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 9
Write a java program that displays the remainder of the division between 2 numbers given
by the user
The output of the program should appear as the following form
Enter number 1 : 10
Enter number 2 : 3
The remainder is: 1
Solution
Int a,b,c;
System.out.print(“Enter number 1: ”);
a=scan.nextInt();
System.out.print(“Enter number 2: ”);
b=scan.nextInt();
c=a%b;
System.out.println(“The remainder is: ” + c);
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 10
Write a java program that determines if a given number by the user is ODD or EVEN.
The number should be greater than 0. (Use do while statement)
The output of the program should appear as the following form
Enter a number:10
10 is even
Solution
int a;
System.out.print("Enter a number : ");
a=scan.nextInt();
if(a%2==0) {
System.out.println(a + " is even ");
}
else
{
System.out.println(a + " is odd ");
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 10 with do while
Write a java program that determines if a given number by the user is ODD or EVEN.
The number should be greater than 0. (Use do while statement)
The output of the program should appear as the following form
Enter a number:10
10 is even
Solution
int a;
do{
System.out.print("Enter a number : ");
a=scan.nextInt();
} while (a<0);
if(a%2==0) {
System.out.println(a + " is even ");
}
else
{
System.out.println(a + " is odd ");
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 11
Write a java program that displays the Bonus of an employee.
The Salary is given by the user.
Display the Bonus depending on the following conditions:
-
If the Salary <= 1000 then display 100
-
Salary >=1001 and <=2000) then display 200
-
Salary >=2001 and <=3000) then display 300
-
Salary >=3001 then display 400
The salary should be greater than 200 and less than 5000. (Use do while statement)
The output of the program should appear as the following form
Enter the salary: 2200
The bonus is 300
Solution
int s;
System.out.print("Enter the salary : ");
s=scan.nextInt();
if(s<=1000) {
System.out.println("The bonus is 100");
}
else if(s>=1001 && s<=2000) {
System.out.println("The bonus is 200");
}
else if(s>=2001 && s<=3000) {
System.out.println("The bonus is 300");
}
else {
System.out.println("The bonus is 400");
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 12
Write a java program that displays the maximum of 2 numbers given by the user.
The output of the program should appear as the following form
Maximum
-------Enter the first number: 20
Enter the second number: 10
The maximum is: 20
Solution
Int a,b;
System.out.println("Maximum ");
System.out.println("----------- ");
System.out.print(“Enter the first number ”);
a=scan.nextInt();
System.out.print(“Enter the second number ”);
b=scan.nextInt();
if(a>b) {
System.out.println(“The maximum is : ” + a);
}
Else {
System.out.println(“The maximum is : ” + b);
}
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 13
Write a java program that calculates the needed operation between two integer numbers
given by the user.
In case user entered number different from 1, 2 or 3, the program should display “Invalid
number”
The output of the program should appear as the following form
Enter a number: 5
Enter a number: 3
Operations:
1- Addition
2- Multiplication
3- Subtraction
Choose from 1 to 3 : 2
The multiplication is 15
Solution
int a,b,c;
System.out.print("Enter a number : ");
a=scan.nextInt();
System.out.print("Enter a number : ");
b=scan.nextInt();
System.out.println("Operations : ");
System.out.println("1-Addition ");
System.out.println("2-Multiplication ");
System.out.println("3-Subtraction ");
System.out.print("Choose a number from 1 to 3: ");
c=scan.nextInt();
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
switch(c) {
case 1:
System.out.println("The addition is " + (a+b));
break;
case 2:
System.out.println("The multiplication is " + (a*b));
break;
case 3:
System.out.println("The Subtraction is " + (a-b));
break;
default: System.out.println("Invalid number ");
}
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 14 (Do – while)
Write a java program that enters an integer number by the user, the number must be
greater than 20;
Solution
int a;
do{
System.out.print("Enter a number : ");
a=scan.nextInt();
} while(a<=20);
Problem Extra instead problem 15 (Do – while)
Write a java program that enters integer number by the user, and then calculates and
displays the summation of them.
The program must stop when the summation become over than 1000.
Solution
int a;
int s=0;
do{
System.out.print("Enter a number : ");
a=scan.nextInt();
s=s+a;
System.out.println("Total = " + s);
} while(s<=1000);
Informatics
PROGRAMMING
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RHHS – SE2
JAVA – Programming Language
Problem 16
Write a java program that enters 5 integer numbers by the user and prints the result of the
square of each number.
The output of the program should be as the following form
Enter a number : 10
The square of 10 is 100
Enter a number : 5
The square of 5 is 25
……
Solution
int I, nb, s;
for(i=1;i<=5;i++) {
System.out.print("Enter a number : ");
nb=scan.nextInt();
s=nb*nb;
System.out.println("The square number of " + nb + " is " + s);
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 17
Write a java program that prints the following sequence of numbers from 0 to 100.
The output of the program should be as the following form
0
2
4
6
…
100
Solution
int i;
for(i=0;i<=100;i=i+2) {
System.out.print(i + " ");
}
Problem 18
Write a java program that displays the following sequence of numbers from 100 to 0.
The output of the program should be as the following form
100
95
90
…
0
Solution
int i;
for(i=100;i>=0;i=i-5) {
System.out.println(i);
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 19
Write a java program that enters 4 integer numbers by the user and verifies for every
number if it is divided with 2 or not.
The output of the program should be as the following form
Enter a number : 10
10 is divided by 2
Enter a number : 11
11 is not divided by 2
……
Solution
Int I, nb;
For(i=1;i<=4;i=i+1)
{
System.out.print(“Enter a number”);
Nb=scan.nextInt();
If (nb%2==0)
{
System.out.println(nb + “is divided by 2”);
}
Else
{
System.out.println(nb + “is not divided by 2”);
}
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 20
Write a java program that enters an integer number by the user and then displays the
multiplication table of it. (Note the number should be >=1)
The output of the program should be as the following form
Enter a number: 5
-------------0 * 5 = 0
1 * 5 = 5
2 * 5 = 10
3 * 5 =15
4 * 5 = 20
5 * 5 = 25
6 * 5 = 30
7 * 5 = 35
8 * 5 = 40
9 * 5 = 45
10 * 5 = 50
Solution
int , nb;
do {
System.out.print("Enter a number : ");
nb=scan.nextInt();
} while(nb<1);
System.out.println("----------------");
for(i=0;i<=10;i=i+1) {
System.out.println(i + " * " + nb + " = " + (i*nb));
}
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 21
Write a java program that enters 10 integer numbers by the user, and then counts
and displays the number of even numbers.
Solution
int i, nb, c;
c=0;
for(i=1;i<=10;i++) {
System.out.print("Enter a number : ");
nb=scan.nextInt();
if(nb%2==0) c=c+1;
}
System.out.println("Count = " + c);
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 22
Write a java program that calculates the total of numbers from 1 to 50 and displays the
result.
S=1+2+3+4+5+… 50
The output of the program should be as the following form
The total of numbers from 1 to 50 is 1275
Solution
int i, s;
s=0;
for(i=1;i<=50;i++) {
s=s+i;
}
System.out.println("The total of numbers from 1 to 50 is = " + s);
Informatics
PROGRAMMING
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JAVA – Programming Language
RHHS – SE2
Problem 23
Write a java program that enters 5 integer numbers by the user, and then displays the total
of them.
Example:
Enter a number : 5
Enter a number : 8
Enter a number : 2
Enter a number : 10
Enter a number : 15
Total = 40
Solution
int i, nb, s;
s=0;
for(i=1;i<=5;i++) {
System.out.print("Enter a number : ");
nb=scan.nextInt();
s=s+nb;
}
System.out.println("Total = " + s);
Informatics
PROGRAMMING
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