一个很值得关注的问题:(C语言, 打印数字表格)

windflowers1976

printf += 有问题============================================
#include<stdio.h>;

main ()
{
        int counter;

        for (counter = 3; counter <= 15; counter += 3)
        {
                printf ("%.d\t%.d\t%.d\t%.d\n", counter, counter /*+=*/+ 2,
                counter /*+=*/+ 4, counter /*+=*/+ 6);
        }

        return 0;
}