选择题

A.if(a<=b) n=0;

B.if((a>b)||(b>c)) n=1; else n=0;

C.if(a>b)if(b>c) n=1;else n=0;else n=0;

D.if(a>b) n=1;else if(b<=c) n=1; else if(b>c) n=1; else n=0;