Exam 1 Preparation - C

Material

• Loop WHILE
• Loop FOR
• IF ELSE IF
• Functions - optional

• Problem 1

  Write a program that reads one positive integer and finds the sum and average of ODD digits. If the number doesn't have odd digits, the program prints an appropriate message. Assume that your input is valid. Don't run your program for numbers larger than 2147483647.

  Example 1: 26448
  Output: no odd digits

  Example 2: 67132
  Output: sum of odd digits is 11, average of odd digits is 3.6666667

• Problem 2

  One airline company charges 10% extra for tickets in the first 5 rows and gives 5% discount for tickets in the last 5 rows. Write a program that first reads the number of family members going on the airplane, the base price for one ticket and the number of rows on the airpline. Then the program reads the row number for each ticket. The program finds the total cost of the tickets and the average ticket price. You can assume that input is valid.

• Problem 3

  Write a program that first reads 1 integer. If the integer is 1 , the program reads a series of non-negative integers between 10 and 99. The first negative value will terminate the input. The program finds sum and average of the numbers with BOTH EVEN digits. USE LOOP WHILE in this part. If the first input integer is 2, the program reads 10 additional integers and finds the amount of inputs that are divisible by 4. USE LOOP FOR in this part. If the first input integer is not 1 or 2, the program prints error message.

• Problem 4

  Write a program that reads 10 integers and finds amount of ints divisible by 3, their sum, product and average. Use loop FOR

• Problem 5

  write a program that reads one integer and finds the number, sum and average of all divisors that are divisible by 3 of the input number example: input 24 all divisors: 1, 2, 3, 4, 6, 8, 12, 24 divisors that are divisble by 3: 3, 6, 12, 24 their sum = 45 average= 45/4.0 = 11.25

• Problem 6

  All stores in some store chain assign 6-digit positive integer number for each product, we will call this number item ID. Last 3 digits of the item ID is a category ID.

• Write a function int count_category(int store_size, int categoryID) that has 2 parameters: number of items in the store and category ID. The function reads 6-digit ID for each item, and finds and returns the number of items in the store in specific category.

• Write a function double ave_category(int stores, int categoryID) that has 2 parameters: number of stores and category ID. The function reads number of items in each store, then uses function count_category to find the number of items in specific category in each store, then finds and returns the average number of items in specific category per store.

• Write main that reads number of stores and 3-digit positive number - ID category. The program finds the average number of items in that category.

  Important: If you only wrote first function, write the following main: the program reads total number of items in the store and 3-digit ID category and finds the number of items in that category.

  ASSUME that ALL INPUT IS VALID