Practice Problem 13

Read it right next to your computer. Book version bitter C

learn through suffering C language learn through suffering
C language

Basics

Question 1-1

What is the term for handling variables of the same type collectively?

Program reading

What is this program calculating?
Determine the answer based on the processing content and variable names.

Question 2-1

#include <stdio.h>

int main(void)
{
    int data[] = { 79, 42, 39, 79, 13, 75, 19 };
    int i, sum = 0, avg;

    for (i = 0; i < sizeof(data) / sizeof(data[0]); i++) {
        sum += data[i];
    }

    avg = sum / (sizeof(data) / sizeof(data[0]));

    printf("%d\n", avg);

    return 0;
}

Program Manual

Question 3-1

Create a program that displays the 10 input numbers from last to first.

explanatory

Question 4-1

Briefly explain what the main advantage of arrays is.

Fundamentals (Answer Key)

Solution 1-1

array

Program Reading (Solution Example)

Solution 2-1

Calculating the average.

Program Documentation (Example Solution)

Solution 3-1

#include <stdio.h>

int main(void)
{
    int data[10];
    int i;

    for (i = 0; i < 10; i++) {
        printf("Please enter the %dth number.:", i);
        scanf("%d", &data[i]);
    }

    for (i = 9; i >= 0; i--) {
        printf("%d ", data[i]);
    }

    printf("\n");

    return 0;
}

Note that the loop is being iterated in reverse order here.
You can also write it to reverse only the specified numbers, as follows.

Another way of writing it.

for (i = 0; i < 10; i++) {
    printf("%d ", data[9 - i]);
}

Descriptive (answer example)

Solution 4-1

By specifying numbers with variables, it's possible to handle a large number of variables collectively.

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Learning C language through suffering (Kushi C) is
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Part 0: Program Overview

What is a program?