单项选择题

有以下程序 #include void fun(int a,int b) { int t; t=a;a=b;b=t; } main() { int c[10]={1,2,3,4,5,6,7,8,9,0},i; for(i=0;i<10;i+=2) fun(c[i],c[i+1]); for(i=0;i<10;i++) printf("%d,",c[i]); printf("\n"); } 程序的运行结果是

A.1.2,3,4,5,6,7,8,9,0,
B.2,1,4,3,6,5,8,7,0,9,
C.0,9,8,7,6,5,4,3,2,1,
D.0,1,2,3,4,5,6,7,8,9,