有以下程序:#includeint main0!int c=0,k;
for(k=1;k<3;k+ +)switch(k){
default: c+=k;
case 2:c++;break;
case 4:c+=2:break;
printf("%d\n",c);
return 1;
程序的结果是:
A. 3
B.5
C 7
D.9