COSC 236

Mock Test #1

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1. Identify and correct syntax/logical errors in each of the following:

A ---------------------------------
int n = 0;
int sum;
while(n <= 10)
    sum = sum + n;
    n++;

B ---------------------------------
char grade;
Scanner input = new Scanner(System.in);
System.out.print("Enter a grade: ");
grade = input.next().charAt(0)
System.out.print("grade = ", grade + \n");

C ---------------------------------
int hours, pay-rate;
if(hours <= 40)
System.out.printf("Regular pay at" + pay_rate);
System.out.println("Wages = " + hours * pay_rate)
else;
System.out.println("This guy has overtime, use the other formula!");

D ---------------------------------
int x = 1;
While(x <= 10);
    x++;
}

E ---------------------------------The following code should display the sum of all numbers 1 - 100:
int i = 1, sum;
while(i < 100)
   sum = sum + i;
System.out.print("The sum of the numbers 1 - 100 =  sum + \n);

F --------------------------------- The following code should display the sum of 2 integers:
int x, y;
Scanner input = new Scanner(System.in);
char again;
do {
System.out.print("Enter 2 integers ");
    x = input.nextInt();
    y = input.nextInt();
System.out.println("The sum = " + x + y);
System.out.println("Do you want to continue? (Y/N): ");
    again = input.next.charAt(0); // next read
} while(again = 'Y' && again = 'y')

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2. What is the output?

A ---------------------------------
for (int i = 0; i <= 5; i++) {
    for (int j = 1; j <= i + 1; j++) {
System.out.print(i);
    }
System.out.println();
}

B ---------------------------------
for (int i = 1; i <= 5; i++) {
    for (int j = 1; j <= 5 - i; j++) {
System.out.print(" ");
    }
System.out.println(i);
}

C ---------------------------------
for (int i = 1; i <= 5; i++) {
    for (int j = 1; j <= i; j++) {
System.out.print(" ");
    }
System.out.println(i);
}

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3. Write a Java program that calculates how much a person would earn after a period of time, according to the following rules:
                1. The starting salary for the first day is $1.
                2. The salary will double each day.
Ask the user to input the number of days worked. The output should display how much the salary was for each day worked, and show the total pay at the end of the work period. Get output similar to the sample output below. Restrictions: don't accept a number less than 1 for input (the person should work at least one day).

SAMPLE OUTPUT:

How many days worked? -9
ERROR! Should be positive. REENTER: 12

Day#        Salary
==================
   1             1
   2             2
   3             4
   4             8
   5            16
   6            32
   7            64
   8           128
   9           256
  10           512
  11          1024
  12          2048
==================
Total pay after 12 days worked: $4095

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4. Write a Java program that reads a 5 digits positive integer and displays the original number separated into individual digits.

SAMPLE OUTPUT:

Enter a 5-digit integer: 123456
ERROR! Should have only 5 digits. REENTER: 12345
For number 12345 the digits are: 1  2  3  4  5

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