Arrays in Software

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Arrays
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Display 59 Two-dimensional Array (part 2 of 3)
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14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 void computeQuizAve(const int grade[][NUMBER_QUIZZES], double quizAve[]); //Precondition: Global constants NUMBER_STUDENTS and NUMBER_QUIZZES //are the dimensions of the array grade Each of the indexed variables //grade[stNum-1, quizNum-1] contains the score for student stNum on quiz quizNum //Postcondition: Each quizAve[quizNum-1] contains the average for quiz numbered //quizNum void display(const int grade[][NUMBER_QUIZZES], const double stAve[], const double quizAve[]); //Precondition: Global constants NUMBER_STUDENTS and NUMBER_QUIZZES are the //dimensions of the array grade Each of the indexed variables grade[stNum-1, //quizNum-1] contains the score for student stNum on quiz quizNum Each //stAve[stNum-1] contains the average for student stNum Each quizAve[quizNum-1] //contains the average for quiz numbered quizNum //Postcondition: All the data in grade, stAve, and quizAve have been output int main( ) { int grade[NUMBER_STUDENTS][NUMBER_QUIZZES]; double stAve[NUMBER_STUDENTS]; double quizAve[NUMBER_QUIZZES];
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<The code for filling the array grade goes here, but is not shown>
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computeStAve(grade, stAve); computeQuizAve(grade, quizAve); display(grade, stAve, quizAve); return 0; } void computeStAve(const int grade[][NUMBER_QUIZZES], double stAve[]) { for (int stNum = 1; stNum <= NUMBER_STUDENTS; stNum++) {//Process one stNum: double sum = 0; for (int quizNum = 1; quizNum <= NUMBER_QUIZZES; quizNum++) sum = sum + grade[stNum-1][quizNum-1]; //sum contains the sum of the quiz scores for student number stNum stAve[stNum-1] = sum/NUMBER_QUIZZES; //Average for student stNum is the value of stAve[stNum-1] } } void computeQuizAve(const int grade[][NUMBER_QUIZZES], double quizAve[])
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Multidimensional Arrays
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Display 59 Two-dimensional Array (part 3 of 3)
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54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 { for (int quizNum = 1; quizNum <= NUMBER_QUIZZES; quizNum++) {//Process one quiz (for all students): double sum = 0; for (int stNum = 1; stNum <= NUMBER_STUDENTS; stNum++) sum = sum + grade[stNum-1][quizNum-1]; //sum contains the sum of all student scores on quiz number quizNum quizAve[quizNum-1] = sum/NUMBER_STUDENTS; //Average for quiz quizNum is the value of quizAve[quizNum-1] } } void display(const int grade[][NUMBER_QUIZZES], const double stAve[], const double quizAve[]) { coutsetf(ios::fixed); coutsetf(ios::showpoint); coutprecision(1); cout << setw(10) << "Student" << setw(5) << "Ave" << setw(15) << "Quizzes\n"; for (int stNum = 1; stNum <= NUMBER_STUDENTS; stNum++) {//Display for one stNum: cout << setw(10) << stNum << setw(5) << stAve[stNum-1] << " "; for (int quizNum = 1; quizNum <= NUMBER_QUIZZES; quizNum++) cout << setw(5) << grade[stNum-1][quizNum-1]; cout << endl; } cout << "Quiz averages = "; for (int quizNum = 1; quizNum <= NUMBER_QUIZZES; quizNum++) cout << setw(5) << quizAve[quizNum-1]; cout << endl; }
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SAMPLE DIALOGUE
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<The dialogue for filling the array grade is not shown>
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Student Ave 1 100 2 10 3 77 4 73 Quiz Average = 10 2 8 8 70 Quizzes 10 10 0 1 6 9 4 10 50 75
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Arrays
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Display 510 The Two-Dimensional Array grade
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student 1 student 2 student 3 student 4
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grade[0][0] grade[1][0] grade[2][0] grade[3][0]
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grade[0][1] grade[1][1] garde[2][1] grade[3][1]
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quiz 2
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quiz 1
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grade[0][2] grade[1][2] grade[2][2] grade[3][2]
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quiz 3
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1 2 3 4
grade[3][0] is the grade that student 4 received on quiz 1
grade[3][1] is the grade that student 4 received on quiz 2
grade[3][2] is the grade that student 4 received on quiz 3
Display 511 The Two-Dimensional Array grade
quiz 2
10 0 6 4
student 1 student 2 student 3 student 4
10 2 8 8
10 1 9 10
quiz 3
quiz 1
100 10 77 73
stAve[0] stAve[1] stAve[2] stAve[3]
quizAve
70 quizAve[0]
50 quizAve[1]
75 quizAve[2]
Summary
Self-Test Exercises
20 What is the output produced by the following code
int myArray[4][4], index1, index2; for (index1 = 0; index1 < 4; index1++) for (index2 = 0; index2 < 4; index2++) myArray[index1][index2] = index2; for (index1 = 0; index1 < 4; index1++) { for (index2 = 0; index2 < 4; index2++) cout << myArray[index1][index2] << " "; cout << endl; }
21 Write code that will fill the array a (declared below) with numbers typed in at the keyboard The numbers will be input five per line, on four lines (although your solution need not depend on how the input numbers are divided into lines)
int a[4][5];
22 Write a function definition for a void function called echo such that the following function call will echo the input described in Self-Test Exercise 21, and will echo it in the same format as we specified for the input (that is, four lines of five numbers per line):
echo(a, 4);