Program to count the number of capital letters, small letters, digits and special symbols in given String

/* Take input into a string and count the number of capital letters,
small letters, digits and special symbols in it. */

#include 

int main(void)
{
 char str[80];
 int x, cap, small, dig, sym;

 printf("\nEnter a string : ");
 gets(str);

 x = cap = small = dig = sym = 0;

 for( ; str[x] != '\0' ; x++)
 {
  if(str[x] >= 'A' && str[x] <= 'Z') cap++;
  else if(str[x] >= 'a' && str[x] <= 'z') small++;
  else if(str[x] >= '0' && str[x] <= '9')  dig++;
  else sym++;

 }

 printf("\nCapital letters %d\nSmall letters %d", cap, small);
 printf("\nDigits %d\nSpecial symbols %d", dig, sym);

 return 0;
}