C Program to count the number of whitespaces, digits ,alphabets and other characters in a given string.

#include  <stdio.h>
#include  <conio.h>

void main()
{
    char  str[50], c ;
    int  i, letter=0, digit=0, white=0, other=0 ;
    clrscr();
    printf("Enter a string: ") ;
    gets(str) ;
    for(i=0 ; str[i]!='\0' ; i++)
        {
            c=str[i] ;
            if( c>='0' && c<='9' )
                digit++ ;
            else if( (c>='A' && c<='Z') || (c>='a' && c<='z') )
                letter++ ;
            else if(c==' ' || c=='\t')
                white++ ;
            else
                other++ ;
        }
    printf("There are %d alphabets in the given string \n", letter) ;
    printf("There are %d digits in the given string \n", digit) ;
    printf("There are %d whitespace characters in the given string \n", white) ;
    printf("There are %d other characters in the given string", other) ;
    getch();
}