十进制转十六进制 代码

 

5621转换为16进制数的方法是“除16取余”方法， 5621/16＝商351余5，16进制最后一位为5 351/16＝商21余15，16进制右边第二位为F 21/16＝商1余5，16进制右边第三位为5 1/16＝商0余1，16进制数右边第四为为1 商0就不继续除了  

最后的结果为15F5

#include <iostream>#include <string>using namespace std;// 整数转换成字符串string  int2str( int  num); int main(int argc, char* argv[]){// 十进制转十六进制int num = 0;cout<<"Please Input A Num "<<endl;cin>>num;string str_num;while(num / 16 != 0){int a = num / 16;int mod_a = num % 16;cout<<"mod_a = "<<mod_a<<endl;string s;switch(mod_a){case 10:s = 'A';break;case 11:s = 'B';break;case 12:s = 'C';break;case 13:s = 'D';break;case 14:s = 'E';break;case 15:s = 'F';break;default:s = int2str(mod_a);break;}str_num = s + str_num;num = a;}if(num % 16 != 0){int last_a = num % 16;str_num = int2str(last_a) + str_num;}cout<<"The Hex Num = "<<str_num<<endl;return 0;}string  int2str( int  num){if (num  ==   0 )return   " 0 " ;string  str  =   "" ;int  num_  =  num  >   0   ?  num :  - 1   *  num;while (num_){str  =  ( char )(num_  %   10   +   48 )  +  str;num_  /=   10 ;} if (num  <   0 )str  =   " - "   +  str;return  str;}