有下列程序void func1(int i);void func2(int i);char st[ ]="hello,friend! ";void func1(int i){ printf("%c",st[i]); if(i<3){i+=2;func2(i);}}void func2(int i){ printf("%c",st[i]); if(i<3){i+=2;func1(i);}}main(){ int i=0;func1(i); printf("\n");}执行后的输出结果是A.hello B.helC.hlo D.hlm