3-3

#include<stdio.h>
int main(void)
{
    int digit,letter,enter,other;
    char ch;
    int i;
    digit=letter=enter=other=0;
    printf("Enter 15 charcters:");
    for(i=1;i<=15;i++){
        ch=getchar();
        if((ch>='a'&& ch<='z')||(ch>='A'&& ch<='Z'))
            letter++;
        else if(ch>='0'&& ch<='15')
            digit++;
        if((ch='\n')||(ch=' '))
            enter++;

        else
           other++;
    }
    printf("letter=%d,digit=%d,enter=%d,other=%d\n",letter,digit,enter,other);

    return 0;

}