C言語を使用して2進数を16進数に変換するにはどうすればよいですか?

0011 1110 0101 1011 0001 1101
  3    E    5    B   1    D

7529D = 0000 0000 0000 0000 0001 1101 0110 1001B
      = 0x00001D69 = 0x1D69

#include <stdio.h>
int main(){
   long int binaryval, hexadecimalval = 0, i = 1, remainder;
   printf("Enter the binary number: ");
   scanf("%ld", &binaryval);
   while (binaryval != 0){
      remainder = binaryval % 10;
      hexadecimalval = hexadecimalval + remainder * i;
      i = i * 2;
      binaryval = binaryval / 10;
   }
   printf("Equivalent hexadecimal value: %lX", hexadecimalval);
   return 0;
}

Enter the binary number: 11100
Equivalent hexadecimal value: 1C