HEX:
复制代码 代码如下:
#include <iostream.h>
#include <iomanip.H>
main(void)
{
long n = 10000;
cout << hex << n ;
return 0;
}

OCT:
复制代码 代码如下:
#include <iostream.h>
#include <iomanip.H>
main(void)
{
long n = 10000;
cout << oct << n ;
return 0;
}

DEC:
复制代码 代码如下:
#include <iostream.h>
#include <iomanip.H>
main(void)
{
long n = 10000;
cout << dec << n << endl;
return 0;
}

复制代码 代码如下:
#include <iostream>
using namespace std;

int main()
{
cout.setf(ios::hex, ios::basefield);

cout << 100; // this displays 64

return 0;
}

复制代码 代码如下:
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int n;
cout << "Enter a decimal number: ";
cin >> n;
cout << n << " in hexadecimal is: "
<< hex << n << '/n'
<< dec << n << " in octal is: "
<< oct << n << '/n'
<< setbase( 10 ) << n << " in decimal is: "
<< n << endl;
return 0;
}