题目内容

若运行以下程序是，从键盘输入2473<回车>，则下面程序的运行结果是。#includeintmain(){intc;while((c=getchar())!='\n')switch(c-'2'){case0:case1:putchar(c+4);case2:putchar(c+4);break;case3:putchar(c+3);default:putchar(c+2);break;}return0;}

A. 668977
B. 668966
C. 66778777
D. 6688766

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