Practice Problem 5

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 do you call naming the memory where numbers are stored?

Question 1-2

What do you call storing numbers in a specific location?

Question 1-3

What do you call increasing the numbers at the aforementioned location by one?

Program reading

How will the program be displayed when executed?

Question 2-1

#include <stdio.h>

int main(void)
{
    int x, y;

    x = 10;
    y = x * 10 + 20;
    printf("%5d\n", y);

    return 0;
}

Program Manual

Question 3-1

Purchase one bottle of soft drink priced at ¥198 and two bottles of milk priced at ¥138 each. Calculate the change when paying with a ¥1,000 bill. Add a 5% consumption tax and round the change amount to the nearest whole yen. You may choose whether to round the consumption tax amount.

explanatory

Question 4-1

When performing calculations with real numbers and integers, such as 3.14 * 12,The answer is to be treated as a real number, but briefly explain why.

Fundamentals (Answer Key)

Solution 1-1

Variable declaration

Variables alone are also considered correct.

Solution 1-2

Assignment

Solution 1-3

increment

Program Reading (Solution Example)

Solution 2-1

　120

Since it's a %5d format specifier, there will be a two-digit space in the preceding part.

Program Documentation (Example Solution)

Solution 3-1

#include <stdio.h>

int main(void)
{
    int juice, milk, money, payment, change;
    double tax;

    juice = 198;
    milk = 138;
    money = 1000;
    tax = 1.05;

    payment = (int)((juice + milk * 2) * tax);
    change = money - payment;

    printf("%dCircle\n", change);

    return 0;
}

Solution 2-1

503 yen

You can solve it without variables, but using them will make changes easier later.
Points will be deducted if you forget to cast.
Answers given as real numbers will also be penalized.
Depending on the calculation method, the answer may vary slightly.

Descriptive (answer example)

Solution 4-1

To prevent decimal numbers from being truncated.

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Learning C language through suffering (Kushi C) is
This is the definitive introduction to the C language.
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Part 0: Program Overview

What is a program?