Summary - Arrays

Use single and multidimensional arrays to write a grade table.

Summary - Arrays

In this section you learned array declaration, access, sizeof, multidimensional arrays and iterating with loops. Now we'll combine them in a grade table app.

The app holds a student's three exam grades in an array; computes the average and assigns a letter grade. It uses both a single-dimensional array and a for loop.

Exercise Average of three grades

Write a C program. Declare int scores[3] = {80, 90, 70};. Initialize int sum = 0;. With for (int i = 0; i < 3; i++) do sum += scores[i];. Print the average with printf("Average: %d\n", sum / 3);. Put #include <stdio.h> at the top.

Show example solution

#include <stdio.h>

int main(void) {
    int scores[3] = {80, 90, 70};
    int sum = 0;
    for (int i = 0; i < 3; i++) {
        sum += scores[i];
    }
    printf("Average: %d\n", sum / 3);
    return 0;
}

Exercise Multidimensional grade table

Write a C program. Declare int grades[2][3] = {{80, 90, 70}, {85, 95, 75}}; (two students, three exams). Print the first student's first grade and the second student's last grade with printf("%d %d\n", grades[0][0], grades[1][2]);. Put #include <stdio.h> at the top.

Show example solution

#include <stdio.h>

int main(void) {
    int grades[2][3] = {{80, 90, 70}, {85, 95, 75}};
    printf("%d %d\n", grades[0][0], grades[1][2]);
    return 0;
}

Test yourself

How is the average of three grades computed?
```
int scores[3] = {80, 90, 70};
int sum = 0;
for (int i = 0; i < 3; i++) sum += scores[i];
```
- scores[0]
- sum * 3
- sum / 3
- 3 / sum
Show answer

sum / 3 — The sum is divided by the count.

Complete the array declaration

int ____[3] = {80, 90, 70};

Show answer

int scores[3] = {80, 90, 70};

Match the array concepts

int scores[3]

Array declaration
scores[0]

First element
sizeof

Byte measure
sum += scores[i]

Accumulation

Next lesson: String basics

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