Count vowel in a string

#include<stdio.h>
#include<string.h>
int main()
{
    int i,length,count = 0;

    char anik[100000];
    gets(anik);

    length = strlen(anik);

    for(i=0;i<length;i++)
    {
        if(anik[i] == 'a' || anik[i] == 'e' || anik[i] == 'i' || anik[i] == 'o' || anik[i] == 'u' || anik[i] ==                  'A' || anik[i] == 'E' || anik[i] == 'I' || anik[i] == 'O' || anik[i] == 'U')
        {
            count++;
        }
    }

    printf("%d\n",count);

    return 0;
}