C Program to count vowels and consonents in a given sentence

Program

#include<stdio.h>
#include<string.h>
int isVowel(char character)
{
	if(character == 'a' || character == 'e' || character == 'i' || character == 'o' || character == 'u' || character == 'A' || character == 'E' || character == 'I' || character == 'O' || character == 'U')
		return 1;
	else
		return 0;
}
void main()
{
	char sentence[100];
	int i, vowels = 0, consonants = 0, digits = 0, spaces = 0;
	printf("Enter a line:\n");
	fgets(sentence, 100, stdin);
	for(i = 0; sentence[i] != '\n'; i++)
	{
		if(isVowel(sentence[i]))
		{
			vowels++;
		}
		else
		{
			consonants++;
		}
	}
	printf("Number of vowels:\t%d\n", vowels);
	printf("Number of consonants:\t%d\n", consonants);
}

Output

$ gcc c-program-count-vowels-consonants-sentence.c 
$ ./a.out
Enter a line:
hello user welcome to oodlescoop
Number of vowels:	13
Number of consonants:	19