下列程序的运行结果是（）#icludestdio.hvoidfu();itmai(){ita=10;fu();pritf(%5dretur0;}voidfu(){ita=20;pritf(%5d}

以下程序的输出结果是（）。#icludestdio.hitf(itx){ity;if(x==0||x==1)retur(3);y=x*x-f(x-2);retur}itmai(){itz;z=f(3);pritf(%d,z);retur0;}