C语言——十进制转换为二进制

#include <stdio.h>
#include <math.h>
//十进制转换为二进制
long long convertDecimalToBinary(int n);
int main()
{
  int n;
  printf("输入一个十进制数：");
  scanf("%d",&n);
  printf("十进制数%d 转换为二进制位 %lld\n",n,convertDecimalToBinary(n));
  return 0;
}
long long convertDecimalToBinary(int n)
{
  long long binaryNumber = 0;
  int remainder,i = 1,step = 1;
  while(n!=0){
    remainder = n%2;    //取余数
    printf("step %d:%d/2,余数 = %d,商 = %d\n",step++,n,remainder,n/2);
    n /= 2;  
    binaryNumber +=remainder*i;
    i*=10;   //*10
  }
  return binaryNumber;
}