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Scanf makes the loop end earlier

c='q';
while(c=='q')
 {
   printf("hello");
   scanf("%c",&c);
 }

Why does the loop exit for no reason when entering data?

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2 answers


I'm going to assume that you want user input to 'q'

mean quit, and you want the loop to end when c == 'q'

.

Try:



c='\0';
while(c !='q')
 {
   printf("hello");
   scanf("%c",&c);
 }
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The loop doesn't go out without a reason. The call scanf

will read the character from stdin

and store it in c

, thereby changing the value c

. When the loop condition is checked, presumably c

not anymore ==

'q'

(for example, you typed something other than "q").

If you try to loop until the user types "q":



do {
    printf("hello");
    scanf("%c", &c);
}
while (c != 'q');

But note that on most console systems scanf

it will not return until the user has typed in a full line of text and pressed enter. If you want to do keyword input, you probably want to look at a different function.

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