Week 05 Tutorial Sample Answers

Arrays Practice

This week, we will discuss arrays, and complete a program to practice writing arrays.

Tutor Demo! (10 mins)

We have been provided the following program that intends to do the following steps but has some flaws.

• Create an integer array with at least 5 elements.
• Create a while loop which loops through every element of the array.
• Write an if statement which adds 1 to each even value. Do this within the while loop.
• Write another while loop which goes through the array with a different iterator (i.e. if you used i last time, use j)
• Print out the values in the array.

// part1_arrays.c, odd_only
//
// Written by YOUR-NAME (YOUR-ZID)
// on TODAYS-DATE 
//
// This program adds 1 to any odd element in an array and after prints 
// all elements in the array

#include <stdio.h>

#define SIZE 5

int main(void) {

    int array = {1, 2, 3, 4, 5};

    int i = 0;
    while (i < SIZE) {
        if (array.i % 2 == 0) {
            array.i += 1;
        }
    }

    int j = 1;
    while (j < SIZE) {
        printf("%c ", array.j);
    }

    printf("\n");

    return 0;
}

We will go through and debug the program so it executes as expected.

// part1_arrays, even_only
//
// Written by Sofia De Bellis, z5418801
// on March 2024
//
// This program adds 1 to any odd values in an array

#include <stdio.h>

#define SIZE 5

int main(void) {

    int array[SIZE] = {1, 2, 3, 4, 5};

    int i = 0;
    while (i < SIZE) {
        if (array[i] % 2 == 1) {
            array[i] += 1;
        }
        i++;
    }

    int j = 0;
    while (j < SIZE) {
        printf("%d ", array[j]);
        j++;
    }

    printf("\n");

    return 0;
}

Your turn!

Copy Array

• Create an array of doubles with 3 elements, each with a non-zero value.
• Create another array of doubles with 10 elements where every element initialised to 0.0.
• Create a while loop that loops through every element of the first array.
• Copy the elements of the first array into the second array (leave 0's at the end)

• Create a while loop that prints out all the elements of the second array.

  Largest Character

• Create a character array with exactly 8 elements.
• Create a character variable called largest_character, equal to the first character of the array.
• Create a while loop to loop through the character array.
• Create an if statement to check if the current character has a higher ascii value than "largest_character"
• Print out the largest character you've found.