Tutorial 8 (Array I)

Transcription

1 Tutorial 8 (Array I) 1. Indicate true or false for the following statements. a. Every element in an array has the same type. b. The array size is fixed after it is created. c. The array size used to declare an array must be a constant expression. d. The array elements are initialized when an array is created. e. The lowest index for array is Which of the following statements are valid array declarations? a. double d[30]; b. char[30] r; c. int i[] = (1, 2, 3, 4, 5); d. float f[] = 2.3, 4.3, 3.2, 5.6; 3. Consider the following declaration: char studentname[15]; In this declaration, identify the following: a. The array name. b. The array size. c. The data type of each array component. d. The range of values for the index of the array. 4. Write C++ statements to do the following. a. Declare an array alpha of 15 components of type int. b. Output the value of the tenth component off the array alpha. c. Set the value of the fifth component of the array alpha to 35. d. Set the value of the ninth component of the array alpha to the sum of the sixth and thirteenth components of the array alpha. e. Set the value of the fourth component of the array alpha to three times the value of the eight components minus 57. f. Output each alpha component per line. 1

2 5. What is the output of the following program segments? a. int temp[5]; temp[i] = 2 * i; cout << temp[i] << ; cout << endl; temp[0] = temp[4]; temp[4] = temp[1]; temp[2] = temp[3] + temp[0]; cout << temp[i] << ; cout << endl; b. int list[5]; for (int i = 0; i<5; i++) list[i] = 2 * i + 5; if (i%2 == 0) cout << list[i] << endl; c. int list[5]; list[0] = 5; for(int i=1; i<5; i++) list[i] = i + 5; if (i>2) list[i] = list[i] list[i-1]; 6. Write C++ statements to define and initialize the following arrays. a. Array heights of 7 components of type int. Initialize this array to the following values: 120, 125, 137, 140, 150, 180, 120. b. Array weights of 5 components of type double. Initialize this array to the following values: 50.1, 56.3, 60.5, 50.4,

3 c. Array seasons of 4 components of type string. Initialize this array to the following values: fall, winter, spring, summer. 7. What is the output of the following code? a. int list[10] = 8, 9, 10, 11, 12; for (int i = 0; i < 10; i++) b. int list[] = 6, 7, 8, 9, 10; c. int one[] = 1, 2, 3, 4, 5; int two[5] = 0; one[i] = two[i]; two[i] = i + one[i]; cout << two[i] << ; 8. Show the output of the following programs. a. #include <iostream> void messy(int x, int y[]) x = 3; y[0] = 3; int number = 0; int numbers[1]; messy(number, numbers); cout << number is << number; cout << and number[0] is << numbers[0]; 3

4 b. #include <iostream> void funny(int list[], int size) if (list[i] % 2 == 1) list[i] += 1; int list[] = 23, 46, 57; int size = 3; funny(list, size); cout<< list[i] << ; c. #include <iostream> void guess(int list[], int size) for (int i=0; i<size/2; i++) int temp = list[i]; list[i] = list[size 1 i]; list[size 1 - i] = temp; int list[] = 1, 2, 3, 4, 5; int size = 5; guess(list, size); cout<< list[i] << ; 4

5 9. Complete the following program which reads the sales for Qtr1, Qtr2, Qtr3 and Qtr4. Each of the value will be read into an array of size 4. Find and print the total sales, average and highest sales. const int SIZE=4; // variable declaration double sales[size]; // sales for 4 quater double total_sales; // to find the total sales double average; // to find the average sales int maxindex; // initialize an array: initializesales(sales, SIZE); // read and store the data into an array: readsales(sales, SIZE); // print an array (each element in the array): printsales(sales, SIZE); // find the total sales: total_sales = findtotalsales(sales, SIZE); // print the total sales cout << "total sales = " << total_sales << endl; // find the average average = total_sales / SIZE; // print the average value cout << "average = " << average << endl; // find the largest element in the array: maxindex = findhighestsales(sales, SIZE); // print the largest Sale cout << "Largest Sale = " << sales[maxindex] << endl; 10. Write a complete C++ program to print months and days as the following table. Month days January 31 February 28 March 31 April 30 May 31 June 30 July 31 August 31 September 30 October 31 November 30 December 31 5