C program to calculate number of vowels separately in an entered string

Write a program to calculate number of vowels (a,e,i,o,u) separately in an entered string

#include <stdio.h>   
int main()
{
	char str[200];
	int a,e,i,o,u,x;
	a=e=i=o=u=0;
	printf("Enter any String : ");
	gets(str);
	for(x=0;str[x]!='\0';x++)
	{
		switch(str[x])
		{
			case 'a':
				a++;
			break;
			case 'e':
				e++;
			break;
			case 'i':
				i++;
			break;
			case 'o':
				o++;
			break;
			case 'u':
				u++;
			break;
		}
	}
	printf("\nNumber of vowels (a) : %d",a);	
	printf("\nNumber of vowels (e) : %d",e);
	printf("\nNumber of vowels (i) : %d",i);
	printf("\nNumber of vowels (o) : %d",o);
	printf("\nNumber of vowels (u) : %d",u);
	return 0;
}

Enter any String : infomax computer academy

Number of vowels (a) : 3

Number of vowels (e) : 2

Number of vowels (i) : 1

Number of vowels (o) : 2

Number of vowels (u) : 1