Help with Array.

**Milo Juak MuTou** · 07-05-2012

Code:

    printf("\t\tPlease Choose:\n");
    printf("\t\t[S]ales\n");
    printf("\t\t[P]ayment\n");
    printf("\t\t[E]xit\n");
    printf("\t\tYour choice: ");
    scanf(" %c", &choice);


    while (choice != 'S' && choice != 's' && choice != 'P' && choice != 'p' && choice != 'E' && choice != 'e')
    {
        printf("\n\t\t*WARNING* INVALID INPUT\n\t\tPlease input your choice correctly: ");
        scanf(" %c", &choice);
    }

How do I change the line :

Code:

while (choice != 'S' && choice != 's' && choice != 'P' && choice != 'p' && choice != 'E' && choice != 'e')

into an Array?

For example,

Code:

char valid[] = {'S', 's', 'P', 'p', 'E', 'e'};

Then I call valid instead of using the long code? ;O

**Salem** · 07-05-2012

man page strchr section 3
Like
while ( strchr("SsPpEe",choice) == NULL )

Or if you don't care about case,
while ( strchr("SPE", toupper(choice) ) == NULL )

**Milo Juak MuTou** · 07-05-2012

Code:

while ( strchr("SPE", toupper(choice) ) == NULL )

What is toupper mean? ;O It include the 's' 'p' 'e'?

Another question :
How do I make my program delay for a few second? sleep(1) seem like don't work for me..
I included <windows.h> but it display "No target architecture" Error.

**std10093** · 07-05-2012

Originally Posted by Milo Juak MuTou

Another question :
How do I make my program delay for a few second? sleep(1) seem like don't work for me..
I included <windows.h> but it display "No target architecture" Error.

You could use time.h and count time

However sleep is much more appropriate.Maybe sleep(1) is too short ,so try sleep(5) and your program is going to stall for 5 seconds
Or you could use function wait
http://www.gidforums.com/t-11552.html

**grumpy** · 07-05-2012

Originally Posted by Milo Juak MuTou

What is toupper mean? ;O It include the 's' 'p' 'e'?

Aww ... cmon! It would take only a tiny effort on your part to find an answer to that question. Either online (googling toupper will find relevant information) or in even basic texts on C describe it.

toupper(choice) converts the value of choice to something else. What do you think the "upper" would mean in the context of characters??

Originally Posted by Milo Juak MuTou

How do I make my program delay for a few second? sleep(1) seem like don't work for me..
I included <windows.h> but it display "No target architecture" Error.
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Techniques to delay a program are compiler and system dependent. sleep() typically works with compilers/libraries under unix. Sleep() is the function in the win32 API. The case difference is important in C.

If you want a portable technique, it is possible to loop checking time, until some period has passed. That technique is not generally recommended, however, as it consumes CPU cycles .... which is not a good idea with modern multi-tasking operating systems, as it affects the behaviour and responsiveness of both the host system and other running programs. The non-portable functions like sleep or Sleep() (depending on your operating system) are better, as they introduce a delay in a manner that has less impact on the host system or on other running programs

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