( 15 )有以下程序
# include<stdio.h>
main ()
{ char a,b,c,d;
scanf ( " %c%c " ,&a,&b ) ;
c=getchar () ; d=getchar () ;
printf ( " %c%c%c%c/n " ,a,b,c,d ) ;
}
当执行程序时 , 按下列方式输入数据 ( 从第 1 列开始 , <CR> 代表回车 , 注意 : 回车也是一个字符)
12<CR>
34<CR>
则输出结果是
A. ) 1234
B. ) 12
C. ) 12
3
D. ) 12
34
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