無限ループのやり方教えてください

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ゆんゆん

無限ループのやり方教えてください

#1

投稿記事 by ゆんゆん » 2週間前

コード:

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
#include <stdlib.h> 
                    
int main()
{
	
	int choice1;
	int choice2;


	printf("\n\n[1]What do you want to see?\n");
	printf("1. The 1980's\n");
	printf("2. The 1990's\n");
	printf("3. The 2000's\n");
	printf("4. Quit\n");

	do
	{
		printf("[1]Enter your choice: ");
		scanf(" %d", &choice1);
		switch (choice1)
		{

		case (1):
		{
			printf("\n\n[2.1]What would you like to see?\n");
			printf("1. Baseball\n");
			printf("2. The Movies\n");
			printf("3. US Presidents\n");
			printf("4. Quit\n");
			printf("[2.1]Enter your choice: ");
			scanf(" %d", &choice2);
			if (choice2 == 1)
			{
				printf("\nWorld Series Champions ");
				printf("of the 1980s:\n");
				printf("1980: Philadelphia Phillies\n");
				printf("1981: Los Angeles Dodgers\n");
				printf("1982: St. Louis Cardinals\n");
				printf("1983: Baltimore Orioles\n");
				printf("1984: Detroit Tigers\n");
				printf("1985: Kansas City Royals\n");
				printf("1986: New York Mets\n");
				printf("1987: Minnesota Twins\n");
				printf("1988: Los Angeles Dodgers\n");
				printf("1989: Oakland A's\n");
				break;
			} else if (choice2 == 2)
			{
				printf("\nOscar-Winning Movies in the 1980s:\n");
				printf("1980: Ordinary People\n");
				printf("1981: Chariots of Fire\n");
				printf("1982: Gandhi\n");
				printf("1983: Terms of Endearment\n");
				printf("1984: Amadeus\n1985: Out of Africa\n");
				printf("1986: Platoon\n");
				printf("1987: The Last Emperor\n");
				printf("1988: Rain Man\n");
				printf("1989: Driving Miss Daisy\n");
				break;
			} else if (choice2 == 3)
			{
				printf("\nUS Presidents in the 1980s:\n");
				printf("1980: Jimmy Carter\n");
				printf("1981-1988: Ronald Reagan\n");
				printf("1989: George Bush\n");
				break;
			} else if (choice2 == 4)
			{
				exit(1);
			} else
			{
				printf("Sorry, that is not a valid choice!\n");
				break;
			}
		}


		case (2):
		{
			printf("\n\n[2.2]What would you like to see?\n");
			printf("1. Baseball\n");
			printf("2. The Movies\n");
			printf("3. US Presidents\n");
			printf("4. Quit\n");
			printf("[2.2]Enter your choice: ");

			scanf(" %d", &choice2);
			if (choice2 == 1)
			{
				printf("\nWorld Series Champions of ");
				printf("the 1990s:\n");
				printf("1990: Cincinnati Reds\n");
				printf("1991: Minnesota Twins\n");
				printf("1992: Toronto Blue Jays\n");
				printf("1993: Toronto Blue Jays\n");
				printf("1994: No World Series\n");
				printf("1995: Atlanta Braves\n");
				printf("1996: New York Yankees\n");
				printf("1997: Florida Marlins\n");
				printf("1998: New York Yankees\n");
				printf("1999: New York Yankees\n");
				break;
			} else if (choice2 == 2)
			{
				printf("\nOscar-Winning Movies in ");
				printf("the 1990s:\n");
				printf("1990: Dances with Wolves\n");
				printf("1991: The Silence of the Lambs\n");
				printf("1992: Unforgiven\n");
				printf("1993: Schindler's List\n");
				printf("1996: The English Patient\n");
				printf("1997: Titanic\n");
				printf("1998: Shakespeare in Love\n");
				printf("1999: American Beauty\n");
				break;
			} else if (choice2 == 3)
			{
				printf("\nUS Presidents in the 1990s:\n");
				printf("1990-1992: George Bush\n");
				printf("1993-1999: Bill Clinton\n");
				break;
			} else if (choice2 == 4)
			{
				exit(1);
			} else
			{
				printf("Sorry, that is not a valid choice!\n");
				break;
			}
		}

		case (3):
		{
			printf("\n\n[2.3]What would you like to see?\n");
			printf("1. Baseball\n");
			printf("2. The Movies\n");
			printf("3. US Presidents\n");
			printf("4. Quit\n");
			printf("[2.3]Enter your choice: ");
			scanf(" %d", &choice2);

			if (choice2 == 1)
			{
				printf("\nWorld Series Champions of ");
				printf("the 2000s:\n");
				printf("2000: New York Yankees\n");
				printf("2001: Arizona Diamondbacks\n");
				printf("2002: Anaheim Angels\n");
				printf("2003: Florida Marlins\n");
				printf("2004: Boston Red Sox\n");
				printf("2005: Chicago White Sox\n");
				printf("2006: St. Louis Cardinals\n");
				printf("2007: Boston Red Sox\n");
				printf("2008: Philadelphia Phillies\n");
				printf("2009: New York Yankees\n");
				break;
			} else if (choice2 == 2)
			{
				printf("\nOscar-Winning Movies in ");
				printf("the 2000s:\n");
				printf("2000: Gladiator\n");
				printf("2001: A Beautiful Mind\n");
				printf("2002: Chicago\n2003: The ");
				printf("Lord of the Rings: The Return of the King\n");
				printf("2004: Million Dollar Baby\n");
				printf("2005: Crash\n");
				printf("2006: The Departed\n");
				printf("2007: No Country for Old Men\n");
				printf("2008: Slumdog Millionaire\n");
				printf("2009: The Hurt Locker\n");
				break;
			} else if (choice2 == 3)
			{
				printf("\nUS Presidents in the 2000s:\n");
				printf("2000: Bill Clinton\n");
				printf("2001-2008: George Bush\n");
				printf("2009: Barrack Obama\n");
				break;
			} else if (choice2 == 4)
			{
				exit(1);
			} else
			{
				printf("Sorry, that is not a valid choice!\n");
				break;
			}
		}
		case (4):
			exit (1);
		default:
			printf("%d is not a valid choice.\n", choice1);
			printf("Try again.\n");
			break;
		}
	} while ((choice1 < 1) || (choice1 > 4));

	return 0;
}



break消したりしてみたんですができなくて本当にわからないです

しょしんしゃ
記事: 9
登録日時: 3週間前

Re: 無限ループのやり方教えてください

#2

投稿記事 by しょしんしゃ » 2週間前

while ((choice1 > 1) || (choice1 < 4));
かな…?

Math

Re: 無限ループのやり方教えてください

#3

投稿記事 by Math » 1週間前

>while ((choice1 > 1) || (choice1 < 4));
>かな…?


while (1);

でいいですよ

実行条件 が常に TRUE ということですからね

Math

Re: 無限ループのやり方教えてください

#4

投稿記事 by Math » 1週間前

for ( ; ; )
{
doit(); // 処理
}

も無限ループです。時々みかけますね

https://kaworu.jpn.org/c/C%E8%A8%80%E8% ... A%E6%96%B9

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