Practice Problem 8

#include <stdio.h>

int main(void)
{
    int year;

    scanf("%d", &year);

    if (year % 2 == 0) {
        if (year % 4 == 0) {
            printf("summer\n");
        } else {
            printf("winter\n");
        }
    } else {
        printf("do not\n");
    }

    return 0;
}

Program Manual

Question 3-1

Write a program that displays the corresponding lunar month when a month is entered.
Also, display a message if a non-existent month is entered.

ヒント:陰暦は1The Moonから順番に、
睦The Moon,如The Moon,弥生,卯The Moon,皐The Moon,Water無The Moon,文The Moon,葉The Moon,長The Moon,神無The Moon,霜The Moon,師走

descriptive

Question 4-1

switch文では各case文の後にbreak文を置くのはなぜか。
また、これが不要なのはどんな場合か簡潔に述べよ。

Fundamentals (Answer Key)

Solution 1-1

else statement

Solution 1-2

else-if statement

Solution 1-3

switch statement or switch-case statement

Program Reading (Solution Example)

Solution 2-1

"Enter a year, and I will tell you if the Olympic Games were held that year."

This program rewrites the problem from the previous chapter using if-else statements.

Program Documentation (Example Solution)

Solution 3-1

#include <stdio.h>

int main(void)
{
    int month;

    printf("The Moonを入力して下さい。");
    scanf("%d", &month);

    switch (month) {
    case 1:
        printf("睦The Moon\n");
        break;
    case 2:
        printf("如The Moon\n");
        break;
    case 3:
        printf("弥生\n");
        break;
    case 4:
        printf("卯The Moon\n");
        break;
    case 5:
        printf("皐The Moon\n");
        break;
    case 6:
        printf("Water無The Moon\n");
        break;
    case 7:
        printf("文The Moon\n");
        break;
    case 8:
        printf("葉The Moon\n");
        break;
    case 9:
        printf("長The Moon\n");
        break;
    case 10:
        printf("神無The Moon\n");
        break;
    case 11:
        printf("霜The Moon\n");
        break;
    case 12:
        printf("師走\n");
        break;
    default:
        printf("そんなThe Moonはありません。\n");
        break;
    }

    return 0;
}

While an if statement is also correct, a switch statement is more suitable when dealing with numerous branches numbered sequentially.
Points will be deducted if the default statement is missing.
Please be sure to remember the break statement.

descriptive (answer)

Solution 4-1

switch文は、対応する番号のcase文までジャンプする機能しかないため、
You need to include a `break` statement at the end of each `case` statement to exit the entire `switch` statement.
However, you can concatenate the `case` statements directly only if there's a commonality in how each case is handled.

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