所以我想写一个有关约旦支付账单和东西的故事。我使用了rand函数为他的薪水3.5k-4.5和账单700 -1.5k找到一个随机数。我相信公式是正确的，但通常情况下，它会在该区域之外生成一个数字。下面是代码和结果。
{
srand(time(NULL));
cout << fixed;
cout << setprecision(2);
float money = 9000;
int minbill = 700;
int maxbill = 1500;
int minsal = 3500;
int maxsal = 4500;
float rent = 3000;
cout << "[Jordan's Balance: Gp" << money << "]\n\n";
cout << "Jordan's rent costs Gp" << rent <<".\n";
float bill = (rand()%maxbill-minbill+1)+minbill;
cout << "Jordan's bills costs Gp" << bill << ".\n";
float totalb = rent + bill;
cout << "Jordan needs to pay a total of Gp" << totalb << "\n\n";
float sal = (rand()%maxsal-minsal+1)+minsal;
cout << "Jordan received a salary of Gp" << sal << "!!\n";
money = money + sal;
cout << "[Jordan's Balance: Gp" << money << "]\n\n";
}
我希望乔丹的账单在700-1.5k左右，而他的薪水在3.5k-4.5k之间，但这给了我一个低于这个数字。
Jordan's rent costs Gp3000.00.
Jordan's bills costs Gp133.00.
Jordan needs to pay a total of Gp3133.00
Jordan received a salary of Gp1906.00!!
[Jordan's Balance: Gp10906.00]
最佳答案
(rand()%maxbill-minbill+1)是错误的。rand()%maxbill可能小于minbill。您需要使用rand() % (maxbill - minbill + 1)。
float bill = rand() % (maxbill-minbill+1) + minbill;
同样，使用
float sal = rand() % (maxsal-minsal+1) + minsal;