Question

I have the following piece of code where check is for char type

do{
      printf("Do you want to add an edge(n to stop adding)\n");
      check = getchar();
}while(check!='n');

and

do{
      printf("Do you want to add an edge(n to stop adding)\n");
      scanf("%c",&check);

}while(check!='n');

Both of them produce the same output

For example for the r\n I get Do you want to add an edge twice and for say tt\n I get the same question thrice followed by asking the input.

My question is how to avoid it and why is it happening?

Answer 1

To solve your issue, try this:

void main()
{
    char check;
    char c;
    do
    {
        printf("Do you want to add an edge(n to stop adding)\n");
        check = getchar();
        do { c = getchar(); } while (c != '\n' && c != EOF);  // This gobbles the rest of the chars on stdin
    } while(check != 'n' && check != EOF);
}