Number of vowels and consonants in a given string in C

#include<stdio.h>
#include<conio.h>
int main()
{
          char sen[80];
          int i;
          int v=0,c=0,spe=0;
          printf("Enter the sentence\n\n");
          gets(sen);
          for(i=0;sen[i]!='\0';i++)
          {
            if(sen[i]=='a'||sen[i]=='e'||sen[i]=='i'||sen[i]=='o'||sen[i]=='u'||sen[i]=='A'||sen[i]=='E'||sen[i]=='I'||sen[i]=='O'||sen[i]=='U')
            {
v = v + 1;
}
else
{
c = c + 1;
}
if(sen[i]=='\t'||sen[i]=='\0'||sen[i]==' ')
{
spe = spe + 1;
}
c = c - spe;
        }
printf("No of v in %s = %d\n",sen,v);
printf("No of c in %s = %d\n",sen,c);
getch();
return 0;
}