C语言进制转换相关函数

C语言进制转换相关函数

所需头文件

#include 
#include 
#include 
#include 

十进制转二进制

//十进制转二进制 
string Decimal_to_Binary(int decimal, int bits)// decimal为所要转换的十进制数，bits为输出位数 
{
 char bin[bits+2];
 bin[0] = '0';
 bin[1] = 'b';
 
 
 int quotient = decimal; //商
 int remainder = 0; //余数
 
 int i;
 
 for(i=bits+2; i>2; i--)
 {
  remainder = quotient % 2;
  switch(remainder)
  {
   case 0:
    {
     bin[i-1] = '0';
     break;
    }
   case 1:
    {
     bin[i-1] = '1';
     break;
    }
   default:
    {
     break;
    }
  }
  quotient = quotient / 2;
 }
 return bin;
}

十进制转八进制

//十进制转八进制 
string Decimal_to_Octal(int decimal, int bits)// decimal为所要转换的十进制数，bits为输出位数
{
 char octal[bits+1];
 octal[0] = '0';
 
 
 int quotient = decimal; //商
 int remainder = 0; //余数
 
 int i;
 
 for(i=bits+1; i>1; i--)
 {
  remainder = quotient % 8;
  switch(remainder)
  {
   case 0:
    {
     octal[i-1] = '0';
     break;
    }
   case 1:
    {
     octal[i-1] = '1';
     break;
    }
   case 2:
    {
     octal[i-1] = '2';
     break;
    }
   case 3:
    {
     octal[i-1] = '3';
     break;
    }
   case 4:
    {
     octal[i-1] = '4';
     break;
    }
   case 5:
    {
     octal[i-1] = '5';
     break;
    }
   case 6:
    {
     octal[i-1] = '6';
     break;
    }
   case 7:
    {
     octal[i-1] = '7';
     break;
    }
   default:
    {
     break;
    }
  }
  quotient = quotient / 8;
 }
 return octal;
}

十进制转十六进制

//十进制转十六进制 
string Decimal_to_Hexadecimal(int decimal, int bits)// decimal为所要转换的十进制数，bits为输出位数
{
 char hexadecimal[bits+2];
 hexadecimal[0] = '0';
 hexadecimal[1] = 'x';
 
 
 int quotient = decimal; //商
 int remainder = 0; //余数
 
 int i;
 
 for(i=bits+2; i>2; i--)
 {
  remainder = quotient % 16;
  switch(remainder)
  {
   case 0:
    {
     hexadecimal[i-1] = '0';
     break;
    }
   case 1:
    {
     hexadecimal[i-1] = '1';
     break;
    }
   case 2:
    {
     hexadecimal[i-1] = '2';
     break;
    }
   case 3:
    {
     hexadecimal[i-1] = '3';
     break;
    }
   case 4:
    {
     hexadecimal[i-1] = '4';
     break;
    }
   case 5:
    {
     hexadecimal[i-1] = '5';
     break;
    }
   case 6:
    {
     hexadecimal[i-1] = '6';
     break;
    }
   case 7:
    {
     hexadecimal[i-1] = '7';
     break;
    }
   case 8:
    {
     hexadecimal[i-1] = '8';
     break;
    }
   case 9:
    {
     hexadecimal[i-1] = '9';
     break;
    }
   case 10:
    {
     hexadecimal[i-1] = 'a';
     break;
    }
   case 11:
    {
     hexadecimal[i-1] = 'b';
     break;
    }
   case 12:
    {
     hexadecimal[i-1] = 'c';
     break;
    }
   case 13:
    {
     hexadecimal[i-1] = 'd';
     break;
    }
   case 14:
    {
     hexadecimal[i-1] = 'e';
     break;
    }
   case 15:
    {
     hexadecimal[i-1] = 'f';
     break;
    }
   default:
    {
     break;
    }
  }
  quotient = quotient / 16;
 }
 return hexadecimal;
}

二进制转十进制

//二进制转十进制 
int Binary_to_Decimal(char Binary[])// decimal为所要转换的二进制数，输入时加上前缀“0b” 
{
 int length = strlen(Binary);
 int i;
 int decimal = 0;
 for(int i=2; i

八进制转十进制

//八进制转十进制 
int Octal_to_Decimal(char Octal[])// decimal为所要转换的二进制数，输入时加上前缀“0” 
{
 int length = strlen(Octal);
 int i;
 int decimal = 0;
 for(int i=1; i

十六进制转十进制

//十六进制转十进制 
int Hexadecimal_to_Decimal(char Hexadecimal[])// decimal为所要转换的二进制数，输入时加上前缀“0x” 
{
 int length = strlen(Hexadecimal);
 int i;
 int decimal = 0;
 for(int i=2; i