写出以下程序的输出结果#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);}