# include & lt; stdio.h>
Void main ()
{
char ch;
Int=0 c, d=0;
Printf (" please enter the characters \ n ");
While (1)
{
The scanf (" % c ", & amp; Ch);
If (ch=='? ')
break;
If (ch> 'a' & amp; & Ch<'z')
C + +;
Else if (ch> '0' & amp; & Ch<'9')
D++;
}
Printf (" % d, % d \ n ", c, d);
}

CodePudding user response:

In the window from the keyboard input string you will first enter the buffer, then the program from the buffer to read
Because the loop is done again, your cycle is read a char character at a time and then followed by three conditional statement judgment
You can also try to use the compiler debugging to step through to see why is a one character at a time