16 binary conversion to dotted decimal string (IP address form)

Include "Csapp.h" void main (int argc,char* argv[]) {char *hex=argv[1]; if (argc<2| | *hex!= ' 0 ' | |  * (hex+1)! = ' x ') printf ("Input error!you should input like this:%s 0x8002c2f2\n", argv[0]);  int dd[4];  int i;    for (i=1;i<=4;i++) {Char ch1 = * (hex+i*2);    Char CH2 = * (hex+i*2+1);    int dd1;    int dd2;    DD1 = Char2int (ch1,15);    DD2 = Char2int (ch2,16);  Dd[i-1] = DD1*16+DD2; } printf ("Dotted decimal form: \t%d.%d.%d.%d\n", dd[0],dd[1],dd[2],dd[3]);}

16 binary conversion to dotted decimal string (IP address form)