#include main() { int x=1,y=0,a=0,b=0; switch(x) { case 1: s

#include main() { int x=1,y=0,a=0,b=0; switch(x) { case 1: switch(y) { case 0: a++; break
#include main()
{ int x=1,y=0,a=0,b=0;
switch(x)
{ case 1: switch(y)
{ case 0: a++; break;
case 1: b++; break;
}
case 2: a++; b++; break;
}
printf(“%d,%d\n”,a,b); } 程序的运行结果是 A）a=1,b=0 B）a=2,b=2 C）a=1,b=1 D）a=2,b=1 求解释?