cout << prices[i] <<setw(15)<< units[i] <<setw(15) << amounts[i] << endl;我知道cout是printf,后面那些都是啥啊。。
printf("%d%15d%15d\n",prices[i] ,units[i],amounts[i]);
setw设置后面的输出宽度，endl相当于输出‘\n'