To display number of vowels in String

//counting number of vowels in a string
#include<stdio.h>
#include<string.h>

int vow(char);
int main()
{
 int count=0,i;
 char str[50];
 printf("enter string");
  gets(str);

//below vow function is for checking the character is an vowel or not
  

for(i=0;str[i]!='\0';i++)
    if(vow(str[i]))
      count++;
      printf("the no. of vowels in  string is %d",count);
}

int vow(char c)
{
   
   if(c=='a'||c=='e'||c=='i'||c=='o'||c=='u')
    return 1;
    return 0;
}