why 'scanf' & 'getchar' adds newline to the input?

user_5542627 0
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I'm trying to test this simple look up table, but can't understand why both scanf and getchar add the newline character ('\n') to the input:

const int arr[10] = {1,0,5,7,6,4,8,2,9,3};
char digit;

printf("enter digits please\n");
digit = getchar();
while ((digit>='0') && (digit<='9'))
{
    printf("%d --> %d\n",digit,arr[digit-'0']);
    digit = getchar();
}
printf("bye bye!");

when runnnig this code, both with printf or getchar() the while loop executes just once, since the newline char ('\n') is also stored in the char variable digit, & I can't figure out why.

scanf getchar c
1 Answers

When you press the Enter key, it adds a newline to the input. If you want to skip that, you need to skip that. One easy way is by using scanf with a space in the format string, which skips all whitespace. Use:

scanf(" %c", &digit);

instead of digit = getchar(); in the two places you do that.

user_164060
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