#include 　　main() 　　{ int x=1,y=0,a=0,b=0; switch(x) { case 1:switch(y#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;case 3:a++; b++;}printf(“a=%d,b=%d\n”,a,b)

#include 　　main() 　　{ int x=1,y=0,a=0,b=0; switch(x) { case 1:switch(y
#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;
case 3:a++; b++;
}
printf(“a=%d,b=%d\n”,a,b);

int x=1,y=0,a=0,b=0;
switch(x)
{ case 1: //此时X=1,进入case1;
switch(y)
{ case 0: a++; break; //此时y=0,进入case0;,a++后break跳出switch(y)
case 1: b++; break;
}
case 2: a++; b++; break; //因为 switch(x) 的 case 1没有break跳出,继续执行a++,b++后break跳出

case 3: a++; b++;
}
最后结果,a=2,b=1