hw9_solution

hw9_solution - EME5 Homework 9 Solutions November 29, 2010...

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Unformatted text preview: EME5 Homework 9 Solutions November 29, 2010 3 Chapter 13, Problem 1 3.1 Part c False. enum by default begins with a 0. 3.2 Part d True. 4 Chapter 13, Problem 5 4.1 Part a struct inventory { char partName[30]; int partNumber; float price; int stock; int reorder; }; 5 Chapter 13, Problem 6 5.1 Solution Code #include <stdio.h> struct Product{ char name[10]; double price; double weight; }s[4]; 1 double totalSale(struct Product fruit) { int n; double total = 0; for (n = 0;n < 4;n++) total += fruit[n].price*fruit[n].weight; return total; } int largestWeight(struct Product fruit) { int n, p; double weight = fruit[0].weight; for (n = 0;n < 4;n++) { if (weight < fruit[n].weight) { weight = fruit[n].weight; p = n; } } return p; } int largestDollar(struct Product fruit) { int n, p; double dollar = fruit[0].weight*fruit[0].price; for (n = 0;n < 4;n++) if (dollar < fruit[n].weight*fruit[n].price) { dollar = fruit[n].weight * fruit[n].price; p = n; } return p; } int main() { char line[200]; double totalsale; int i, weightindex, dollarindex; fgets(line, 200, stdin); /* skip the comment line */ printf("%s", line); for (i = 0;i < 4;i++) /* input data */ scanf("%s%lf%lf", s[i].name, &s[i].price, &s[i].weight); 2 for (i = 0;i < 4;i++) /* print out to verify the input data */ printf("%-6s %8lf %8lf\n", s[i].name, s[i].price, s[i].weight); totalsale = totalSale(s); printf("\nThe total sale for a day is $%.2lf\n", totalsale); weightindex = largestWeight(s); printf("The largest weight sold is %s with %.2lf pound.\n", s[weightindex].name, s[weightindex].weight); dollarindex = largestDollar(s); printf("The product with the largest dollar amount sold is %s.\n", s[dollarindex].name); return 0; } 5.2 Solution Output # product name, unit price ($), units (pound) sold orange 1.200000 506.210000 apple 1.250000 944.230000 grape 2.250000 393.500000 cherry 4.250000 234.560000 The total sale for a day is $3669.99 The largest weight sold is apple with 944.23 pound. The product with the largest dollar amount sold is apple. 6 Chapter 13, Problem 14 6.1 Solution Code #include <stdio.h> /* define a sentinel number for end of data */ #define EOD -1 struct Student { int id; char name[32]; double gpa; }; double averageGPA(struct Student *sp) { double gpa, totalval; int i; totalval=0.0; 3 for(i=0; sp->id != EOD; i++, sp++) { totalval += sp->gpa; } gpa = totalval/i; return gpa; } int main() { struct Student s = {{101, "John", 3.33}, {102, "Doe", 3}, {103, "Peter", 3.1}, {EOD, NULL, EOD}}; printf("GPA for students in the list is %.2f\n", averageGPA(s)); return 0; } 6.2 Solution Output GPA for students in the list is 3.14 7 Chapter 13, Problem 19 The value returned is 13. The cast operation is not necessary....
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hw9_solution - EME5 Homework 9 Solutions November 29, 2010...

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