A.if((a>B)&&(b>C))k=1;
B.if((a>B)II(b>C))k=1; else k=0; else k=0:
C.if(a<=B)k=0;
D.if(a>B)k;1; else if(b<=C)k=1; else if(b>C)k=1; else k=0: