اختبار تجريبي لمادة it232 نصفي - الجامعة السعودية الإلكترونية. تجميعة و اختبار تفاعلي.

Which of the following statements is valid?

When the program runs and gives the incorrect results, this type of errors called:

What is the output of this program?
```java
class increment {
    public static void main(String args[]) {
        double var1 = 1 + 5;
        double var2 = var1 / 4;
        int var3 = 1 + 5;
        int var4 = var3 / 4;
        System.out.print(var2 + " " + var4);
    }
}
```

What is the output of this program?
```java
class Output {
    public static void main(String args[]) {
        int x, y;
        x = 10;
        x++;
        --x;
        y = x++;
        System.out.println(x + " " + y);
    }
}
```

What is the result of compiling and running this program?
```java
public class test {
    public static void main(String args[]) {
        int i, j;
        int k = 0;
        j = 2;
        k = j = i = 1;
        System.out.println(k);
    }
}
```

The following code is illegal:
```java
double d = 187.2;
int j = d;
```
Rewrite the code using an integer cast to make it legal.

Suppose a Scanner object, kbReader, has already been created. Which line of code uses kbReader to input a number with decimal places from the keyboard and store the result in the variable frac?

Which of the following results is correct when evaluating 0%3?

Consider the following program:
```java
import myLibrary.*;
public class ShowSomeClass {
    // code for the class...
}
```
What is the name of the java file containing this program?

What is the output of:
System.out.println(1+1+1+"7"+1+1+1);

What is the output of:
System.out.println((1+1+1)+"7"+1+1+1);

What is the output of:
System.out.println(1+1+1+"7"+(1+1+1));

Identify and fix the errors in the following code:
```java
Public class Equation {
    public void static main(String []args) {
        int x=5.5;
        double y=x*x
        System.out.println("X= " + x + "Y = " y);
    }
```

What is the output of this program?
```java
class Output {
    public static void main(String args[]) {
        int a = 1;
        int b = 2;
        int c, d;
        c = ++b;
        d = a++;
        c++;
        b++;
        ++a;
        System.out.println(a + " " + b + "\n" + c);
    }
}
```

What will be the value of the integer variable 'ans' after executing:
ans = 9 / 4 + 2 * 3 / 2 - 5 % 2;

What will be the value of the integer variable 'ans' after executing:
ans = 2 / 3 * 3 + 6 * 8 % 3 * 4;

The following program has errors. Rewrite it with no errors such that the output must be 8.0 without changing any literal:
```java
Public Class ShowErrors {
    Public static void Main(String[] args) {
        int y = 1.5, int x = y + 2;
        System.out.print(y + x + 3.5);
    }
}
```

Write an algorithm for: A program to read student name, ID and three exams marks (First_exam, Second_exam, Third_exam). Then print the student details and total mark.
Total mark = Midterm exam + (Third_exam)/2
Midterm exam = 20% of First_exam + 30% of Second_exam
All exams out of 100.

Write a complete Java program that reads student name, ID and three exam marks, then prints student details and total mark.
Total mark = Midterm + Third_exam/2
Midterm = 0.20 * First_exam + 0.30 * Second_exam

Statement 5/0; comes under which of the following programming error category?

Which of the following is a valid assignment statement (assume the variables are properly declared)?

Which of the following results is correct when evaluating 25%3?

What is k after the following statements?
```java
int k = 10;
int h = 5;
k /= h + 3;
```

Which of the following variable declaration would NOT compile in a Java program?

To convert a string s into a double value, you can use:

The statement result=result/(a%b/(a+b)); is equivalent to:

What is the output of the following code?
```java
int x = 10/5.0;
System.out.println(x);
```

What will be the output when you compile and run the following code?
```java
class Datatype {
    public static void main(String[] args) {
        byte num = 130;
        System.out.print(num);
    }
}
```

What is the output of the following program?
```java
public class Test {
    public static void main(String[] args) {
        int x = 3;
        int y = x * x--;
        System.out.println("y is " + y + " and x is " + x);
    }
}
```

What is the output of the following code fragment?
```java
double B = 5.9;
System.out.print("B is " + (int)B);
```

What is the output of the following statements?
```java
System.out.println((double)(3*5/2));
System.out.println(3*(double)(5/2));
System.out.println(3*5/(double)(2));
```

Determine the output of the following code:
```java
int x = 3;
int y = 4;
String s = "S";
System.out.print("output is " + s + x + y);
System.out.print(" output is " + s + (y + y));
```

What is the result of the following Java arithmetic expression? Show your work:
6 * (-2) / 3 - 2 / 2 + 2

Write an algorithm for: Given the original price of an item and a discount percentage, calculate and output the final price and the amount saved.

Write a complete Java program: Given the original price and discount percentage, calculate and output the final price and amount saved.
Sample output:
What is the original price? 59.99
What is the discount (in percent)? 35
The original price is: SR 59.99
Your discount is: 35%
You are saving SR 20.9965 today
Your total is: SR 38.9935

Operator (?:) can replace which of the following statements?

______________ In Java makes computer execute statements one after another.

What is the scope of a local variable in Java?

One of the following is Invalid Identifier (e.g. user defined variable) in Java programming language.

Which statement is a selection statement?

To read Input from the keyboard (e.g. from the user), we have to create and use a/an ______________ object.

The ______________ is the routine process of locating and removing bugs, errors or abnormalities from programs.

The procedure of solving a problem in regards to action and sequence order called ______________.

The Informal language that cannot be executed on a computer is ______________.

The Escape Sequence ______________ is used to print double-quote (") inside print statement.

A/An ______________ is a location in the computer's memory where a value can be stored for later uses in a program.

To display formatted text, ______________ can be used.

In Java, ______________ executes a block of code if a condition is true, but if false it executes another block of code.

The arithmetic operators *, /, %, + and - all have the same level of precedence.

What is the name of the = operator in Java?

The increment expression in a for statement acts as if it's a standalone statement at the end of the for's body.

One of the most important features for the bytecode instructions is platform independent.

if statement is an example of repetition Statements.

When a Java program is compiled, the file produced by the compiler ends with the ______ file extension.

What is the output of the following code snippet?
```java
int number = 10;
switch(number) {
    case 5: System.out.println("5"); break;
    case 10: System.out.println("10"); break;
    case 15: System.out.println("15"); break;
    default: System.out.println("Not in 5,10 or 15");
}
```

Which operator can be used to compare two values?

The Java compiler ignores any text between:

The do while statement tests the loop-continuation condition after executing the loop's body therefore, the body always executes at least once.

The continue statement, when executed in a repetition statement, skips the remaining statements in the loop body and proceeds with the next iteration of the loop.

A loop inside another loop statement is called a:

Which loop does not check a condition at the beginning of the loop?
I. The do loop
II. The while loop
III. The for loop

What is the output of the following code snippet?
```java
double x=10.0, y=4.0;
int a=10, b=4;
System.out.println(x/y);
System.out.println(x/b);
System.out.println(a/y);
System.out.println(a/b);
System.out.println(a%b);
```

What is the output of the following code fragment?
```java
int i=1;
int sum=0;
while (i<=5) {
    sum=sum+i;
    i++;
}
System.out.println("The value of sum is " + sum);
```

In high-level languages, programmers began using English-like abbreviations to represent elementary operations.

What is the output of the following code?
```java
int a=5, b=15, c=20;
if(a<b)
    System.out.println("####");
else
    System.out.println("&&&&");
System.out.println("****");
```

What is the output of the following code?
```java
int a=5, b=15, c=20;
if(a<b)
    if(a<c)
        System.out.println("1111");
    else
        System.out.println("2222");
```

What is the output of the following code?
```java
if (5>2)
    System.out.print("Hello");
System.out.println("*****");
```

The programs that translate high-level language programs into machine language are called:

How many times does the code snippet given below display "Loop Execution"?
```java
int i=1;
while (i!=10) {
    System.out.println("Loop Execution");
    i++;
}
```

Java source code files are given a name ending with the .java extension.

The expression ((x>y) && (a<b)) is true if either x>y is true or a<b is true.

The while statement tests the loop continuation condition after executing the loop's body.

Write a full Java program to print the following pattern using nested for loop:
1
12
123
1234
12345

Write a full Java program that reads a number x, then prints all numbers between 1 and x which are divisible by 3 or 5.
Example: Input: 20 → Output: 3 5 6 9 10 12 15 18

Write a Java statement to test whether variable X is positive. If it is, print "X is positive". If not, print "X is negative".

Which statement best describes a computer program?

private instance variables ________________.

A method which changes state of its implicit parameter is known as _______________.

Constructors contain instructions to _______________.

Which is the correct version of Java code constructing an object of class Rectangle?

Which of the following is the correct syntax for if statement?
int x = 5; String size = "";

Which of the following values does not have a primitive data type?

Which Java statements change the string "SEU" to "seu"?

What kind of operator is the <= operator?

Encapsulation is the process of hiding object data and providing methods for data access.

In Java, the garbage collector periodically reclaims objects when they are no longer used.

java.util package is automatically imported in any Java program.

Every statement with if must also include else.

Invoking a method means asking the method to do its job.

Find the output of the following Java code:
```java
public class Circle {
    double radius = 1;
    public static final double PI = 3.14;
    public static void main(String[] args) {
        double volume = PI * radius * radius;
        System.out.println(volume);
    }
}
```

Find the output of the following Java code:
```java
public class Test {
    public static void main(String[] args) {
        int value = 20;
        value = value * 2;
        value--;
        System.out.println(value);
    }
}
```

Find syntax errors in the following Java code:
```java
public class test1 {
    public Static void main(String[] a) {
        int x = 30;
        byte y = 10;
        if(x = 30) {
            if(y > 10) {
                system.out.print("X = 30" + and Y > 10");
            } else(y == 10) {
                System.out.print("X = 30 and Y = 10");
            }
        }
    }
}
```

Write a program in Java to read three numbers from the user and print the largest number.

Define Identifier. List 3 rules for declaring an identifier.

Which command is used to compile a Java program into bytecode, producing a .class file such as Welcome.class?

Which component of the Java platform executes the bytecode produced by the Java compiler?

What will be the output of the following Java code?
```java
System.out.printf("%B %S %d", false, "Hello", 230);
```

What does the following Java statement do?
```java
String s = input.next();
```

اختبار تفاعلينصفي - it232