#include <stdio.h>
int main()
{
    char c;
    int lettlers = 0,space = 0, digit = 0,others = 0;
    printf("please input some charachers\n");
    while((c=getchar())!='\n')
{
    if(c>='a'&&c<='z'||c>='A'&&c<='Z')
    {
     letters++;
    }
    else if (c==' ')
    {
     space++;
    }
    else if (c>='0'&&c<='9')
    {
     digit++;
    }
   else
        others++;
}
printf("all in all:char=%d space=%d digit=%d others=%d", letters, space, digit, others);
    return 0;
}

#include <stdio.h>
int main()
{
    char c;
    int lettlers = 0,space = 0, digit = 0,others = 0;
    printf("please input some charachers\n");
    while((c=getchar())!='\n')
{
    if(c>='a'&&c<='z'||c>='A'&&c<='Z')
    {
     letters++;
    }
    else if (c==' ')
    {
     space++;
    }
    else if (c>='0'&&c<='9')
    {
     digit++;
    }
   else
        others++;
}
printf("all in all:char=%d space=%d digit=%d others=%d", letters, space, digit, others);
    return 0;
}