Menu problems....

[Gil Carvalho]

Hi;

I having a problem with those menu, when i choose in the first menu an option to go to another submenu it works well, if i use the option to return to last menu the option works but puts invalid option....i can't choose another option..

main menu

void menu_principal(void)
{
	char ch;
	printf("BEMVINDOS AO BUZ \n");
	printf("1 - Entrar como Administrador \n");
	printf("2 - Entrar com Jogador \n");
	printf("3 - Sair da aplicacao \n");
	printf("Escolha uma das seguintes opcoes \n");
	ch = getchar();
	switch(ch)
	{
	case '1':
	adm();
	break;
	case '2':
	jogo();
	break;
	case '3':
	//
	break;
	default :
	printf("Opcao invalida");
	}
}

2º menu

void jogo(void)
{
	char ch;
	fflush(stdin);
	printf("1 - Jogo curto (2 perguntas) \n");
	printf("2 - Jogo medio (4 perguntas) \n");
	printf("3 - Jogo grande (8 perguntas)\n");
	printf("4 - Voltar ao menu inicial \n");
	ch = getchar();
	switch(ch)
	{
	case '1':
	gp1_Ques();
	break;
	case '2':
	printf("jogo 4()");
	break;
	case '3':
	printf("jogo 8()");
	break;
	case '4':
	menu_principal();
	break;
	default :
	printf("Opcao invalida");
	}
}

So after entering in this last menu, if i want to use the option 4 to return to main menu i have this:
BEMVINDOS AO BUZ
1 - Entrar como Administrador
2 - Entrar com Jogador
3 - Sair da aplicacao
Escolha uma das seguintes opcoes

opcao invalida (invalida option)

What's wrong??

Thanks

[claudiu]

Most likely 'return' keys left in the buffer get picked up as the next input.

[memcpy]

FFS, your OP here is worse than your OP 3 days ago with the same code. All you've done is removed indentation and added a fflush(stdin).

[Gil Carvalho]

Return??

I don't have any return...
It's really strange....scanf and fgets....

[claudiu]

return is the enter key. When you input one character on the keyboard you press two keys: the character key (for example 'k') and the enter key. The latter is left in the input buffer, so the next time you call getchar() it won't let you press anything because it already has the return key as input.

Now, if you are thinking that the solution to this is to use fflush(stdin) you are wrong, because fflush is not defined to work on input streams.

[Gil Carvalho]

Ok claudiu, i have already get it., now it's works.

void jogo(void)
{
	int input;
    printf("1 - Jogo curto (2 perguntas) \n");
	printf("2 - Jogo medio (4 perguntas) \n");
	printf("3 - Jogo grande (8 perguntas)\n");
	printf("4 - Voltar ao menu inicial \n");
    printf("Escolha uma das seguintes opcoes \n");
    scanf( "%d", &input );
    switch ( input )
    {
        case 1:
            gp1_Ques();
            break;
        case 2:
            printf("Jogo 4");
            break;
        case 3:
            printf("Jogo 8");
            break;
        case 4:
            menu_principal();
            break;
        default:
            printf( "Bad input, quitting!\n" );
            break;
    }
    getchar();
}

Iv'e used getchar();

Thanks

[claudiu]

Good stuff.