Write a program in c to convert binery number to hexa decimal number?

Answer 1

The question is somewhat ambiguous. If you have a value stored in a c variable, you can output it as a hexadecimal value by using a %x specification (printf("%x",z); prints z as a hex value.

There is no specification (in most versions of c to input a binary number).

If you mean convert a string which looks like a binary number to a string which looks like a hexadecimal number, then here is a code fragment

char b[21]; // b holds binary string - 1 extra byte for null

char h[6]; // h holds hex string - 1 extra byte for null

char *p;

int s;

p=b;

s=0;

while (*p)

{

s = (s << 1) + (*p-'0');

p++;

}

sprintf(h,"%x",s);