Sums integers while user enters 0

switch-case.c

#include<stdio.h>
int main()
{
	int x;
	
	printf("Enter a one digit integer: ");
	scanf("%d",&x);
	
	switch(x)
	{
		case 1: printf("\nOne.");break;
		case 2: printf("\nTwo.");break;
		case 3: printf("\nThree.");break;
		case 4: printf("\nFour.");break;
		case 5: printf("\nFive.");break;
		case 6: printf("\nSix.");break;
		case 7: printf("\nSeven.");break;
		case 8: printf("\nEight.");break;
		case 9: printf ("\nNine.");break;
		default: printf("\nThis integer isn't one digit...");
	}
}