[White] [Diary of an error has been resolved errors C language simple sum = a + b program encountered

Today, ready to re-read through the basics of the C language, write a small program with a simple request of the sum of a and b. But the result turned out not to have been returned, the source code is as follows:

#include <stdio.h>
 int main () 
{ 
    int A, B, SUM; 
    the printf ( " Please enter the number of the value of two, spaced \ n comma " ); 
    Scanf ( " % D, D% " , A & , & B); 
    SUM = a + B; 
    the printf ( " \ n-two numbers are D% " , SUM); 

}

However, running is not the result of a and b and checked again, and there is no obvious error.

Finally found is the use of full-width during input comma separate the two numbers, resulting in abnormal results.

Later try to use spaces in the programming process, etc., will be input separately, to avoid mistakes.