Practice Problem 10

Read it right next to your computer.

Book version bitter C

Read it right next to your computer.

Book version bitter C

Read it right next to your computer.

Book version bitter C

Read it right next to your computer.

Book version bitter C

learn through sufferingC Language

Fundamentals

Question 1-1

What is the name for a loop where the condition is checked first, like in a while statement?

Question 1-2

What is the term for a loop where the condition is checked after execution, like a do-while loop?

Program reading

What is the purpose of the following program?
Determine the answer based on the processing content and variable names.

Question 2-1

#include <stdio.h>

int main(void)
{
    int year = 0;
    double money = 10000;

    while (money < 15000) {
        year++;
        money *= 1.01;
    }

    printf("%d , %f\n", year, money);

    return 0;
}

Program Manual

Question 3-1

I want to create a program that takes test scores as input.
ただし、テストの点数は0～100までしかないので、
"If anything other than the expected input is entered, prompt the user to re-enter it."

descriptive

Question 4-1

Briefly explain why do-while loops are well-suited for input validation.

Fundamentals (Answer Key)

Solution 1-1

Preliminary screening

Solution 1-2

Post-assessment

Program Reading (Solution Example)

Solution 2-1

Gold利year1%の銀行に10000円を預けた場合に、
A program that displays how many years it will take to reach 15,000 yen.

Program Documentation (Example Solution)

Solution 3-1

#include <stdio.h>

int main(void)
{

    int score;

    do {
        printf("点数を入力して下さい:");
        scanf("%d", &score);
    } while (score < 0 || score > 100);

    printf("入力された点数 %d\n", score);

    return 0;
}

"If you want to display a message when re-entering data, do the following."
The initial input is distinguished by checking if the variable 'score' is equal to 0.
"If a score of 0 is entered, the loop will exit, so the conditions won't overlap."

Answer 3-1 Solution 2

#include <stdio.h>

int main(void)
{

    int score = 0;

    do {
        if (score != 0)
            printf("点数は 0～100の範囲で入力して下さい。\n");
        printf("点数を入力して下さい:");
        scanf("%d", &score);
    } while (score < 0 || score > 100);

    printf("入力された点数 %d\n", score);

    return 0;
}

問題

descriptive (answer)

Solution 4-1

do-while loopはPost-assessmentループなので、初めに必ず1回はrunされ、
To ensure that no input is missed.

About This Site

Learning C language through suffering (Kushi C) is
This is the definitive introduction to the C language.
It systematically explains the basic functions of the C language.
The quality is equal to or higher than commercially available books.

Part 0: Program Overview

What is a program?