写出下面程序的运行结果 __________ 。 main() { int x,y=1,z=0; if(y!=0) x=5; printf("x=%d \ t",x); if(y==0) x=3; else x=5; printf("x=%d \ t \ n",x); x=1; if(z<0) if(y>0) x=3; else x=5;printf("x=%d \ t \ n",x); if(z=y<0) x=3; else if(y==0) x=5; else x=7; printf("x=%d \ t",x); printf("z=%d \ t \ n",z); if(x=z=y) x=3; printf("x=%d \ t",x); printf("z=%d \ t \ n",z); }