Section 17.6 Advanced Array Practice

More practice? Yes! I don’t have to remind you that practice makes perfect, right? Please pick and solve at least one of the following problems:

Subsection 17.6.1 Option 1

Activity 17.4.

Write a program that prompts the user to enter the weight of a letter and that tells the user the postage necessary to mail this letter with the US Postal Service.

Here is a sample output:

How much does your letter weigh (in ounces): 5.5
The postage is 203 cents.

Note: You can start with the code given below. Postage is calculated based on the next higher weight in the chart.

Compile and run the code below in your own C environment.

#include <stdio.h>
#define N 14    /* number of weights in the array */

int main (void) {
  float weights[N] = {1, 2, 3, 3.5, 4, 5, 6, 7, 8,
                      9, 10, 11, 12, 13};  /* weight in ounces */
  int stamp[N] = {49, 70, 91, 112, 161, 182, 203, 224, 245,
                 266, 287, 308, 329, 350};   /* price in cents */
  float letter;   /* user's letter weight in cents */
  
  
  printf("How much does your letter weigh (in ounces): ");
  scanf("%f", &letter);
  
  
/* Your code goes here! */

  
  return 0;
}

Subsection 17.6.2 Option 2

Activity 17.5.

Write a C-program that finds the largest integer stored in an array of integers. You can write your code so that the array values are entered by the user, or you may simply hardcore an integer array for test purposes as is done below.

Compile and run the code below in your own C environment.

#include <stdio.h>
#define N 10
int main (void) {
    int array[N] = {45, 87, -12, 0, 44, 100, -99, 3, 2, -4};
    
    /* Your code goes here. */
    
    return 0;
}

Subsection 17.6.3 Option 3

Activity 17.6.

Write a C program that finds the average of integer numbers stored in an array. You may have the user enter the array values, or you can simply hard-code the array for testing purposes as is done below.

Compile and run the code below in your own C environment.

#include <stdio.h>
#define N 10
int main (void) {
    int array[N] = {45, 87, -12, 0, 44, 100, -99, 3, 2, -4};
    
    /* Your code goes here. */
    
    return 0;
}

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