Practice Problem 10

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 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 program is intended to display what?
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 to input test scores. However, since test scores can only range from 0 to 100, if any other value is entered, the program should prompt the user to re-enter it.

explanatory

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

A program that displays how many years it takes for 10,000 yen deposited in a bank with an annual interest rate of 1% to grow to 15,000 yen.

Program Documentation (Example Solution)

Solution 3-1

#include <stdio.h>

int main(void)
{

    int score;

    do {
        printf("Please enter the score.:");
        scanf("%d", &score);
    } while (score < 0 || score > 100);

    printf("Input score %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("Please enter scores in the range of 0 to 100.\n");
        printf("Please enter the score.:");
        scanf("%d", &score);
    } while (score < 0 || score > 100);

    printf("Input score %d\n", score);

    return 0;
}

Question

Descriptive (answer example)

Solution 4-1

The do-while statement is a post-condition loop, so it always executes at least once initially, preventing situations where no input is entered.

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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?