C++使用千位分隔符

本代码演示了如何使用千位分隔符“,”格式化数字输出

//Example for using thousand separator (,) for decimal integer numbers
#include <iostream>
#include <cstdlib>
 
using namespace std;
 
int main()
{
    int j , i = 0, k = 0 ,ix;
    cout << "To Exit press Ctrl+z\n";
    cout << "Enter decimal integer number: ";
    while(cin >> ix)
    {
        cout << endl;
        if( ix < 0)//test if the number is negative
        {
            cout << '-';
            ix *= -1;
        }
        int temp = ix;
        int p = 1;
        while( temp > 0) //counting number of digits
        {
            temp /= 10;
            p *= 10;
            i++;
        }
        j = i % 3;
        p /= 10;
 
        while( i > 0 )//display integer number with 1000 seperator
        {
            cout << char ((ix/p) +'0');
            ix %= p;
            p /= 10;
            i--;
            k++;
            j--;
            if ((k % 3 == 0 && i > 0)||(j == 0 && i > 2) )
            {
                cout <<",";
                k = 0;
            }
        }
        cout << endl << endl;
        cout << "To Exit press Ctrl+z\n";
        cout << "Enter decimal integer number: ";
    }
    return 0;
}
/*Program's output
************************
To Exit press Ctrl+z
Enter decimal integer number: -23487654
 
-23,487,654
 
Press any key to continue . . .
*/