这是我到目前为止所写的内容。我认为它会完美地工作，因为我大部分从我的旧Plinko实验室代码中转录它，我没有使用函数，更改它以便模拟器块成为它自己的功能。但是，我得到了五个错误。
第17行（ran = ran（）％2）：＆＃34;表观调用的括号前面的表达式必须具有（指针 - ）函数类型＆＃34;。这是什么意思？
在第10行（（srand（time（0））;）：＆＃34;＆＃39;参数＆＃39 ;:从＆time; t＆＃39;转换为＆＃39; unsigned int＆＃39 ;，可能丢失数据＆＃34;。这是什么意思？
再次在第17行：＆＃34;术语不评估为采用0参数的函数＆＃34;。这是什么意思？
第99行（drop_simulator（slot_number，1）;）：＆＃34;＆＃39;参数＆＃39;：来自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能丢失数据＆＃34;。我该如何防止这种情况？
第129行（total_rewards + = drop_simulator（slot_number，0）;）：与上述相同。
我将不胜感激任何帮助。我觉得我已经做了我可能做的一切，但感觉好像我已经遇到了这个问题。
#include <iostream>
#include <cstdlib>
#include <math.h>
#include <time.h>
using namespace std;
double drop_simulator(int slot_number, int number_of_chips_dropped)
{
srand(time(0));
double plink;
double ran;
double location;
location = slot_number;
for (int i = 0; i < 12; i++)
{
ran = (ran() % 2);
plink = ran;
plink -= 0.5;
location += plink;
if (location >= 8)
{
location -= 1;
}
else if (location <= 0)
{
location += 1;
}
if (number_of_chips_dropped == 1)
{
cout << location << endl;
}
}
int reward = 0;
if (location == 0)
{
reward = 100;
}
else if (location == 1)
{
reward = 500;
}
else if (location == 2)
{
reward = 1000;
}
else if (location == 3)
{
reward = 0;
}
else if (location == 4)
{
reward = 10000;
}
else if (location == 5)
{
reward = 0;
}
else if (location == 6)
{
reward = 1000;
}
else if (location == 7)
{
reward = 500;
}
else if (location == 8)
{
reward = 100;
}
return reward;
}
int main()
{
int input = 0;
while (input != 3)
{
cout << "Please select one of these three options." << endl;
cout << "1 - Drop a single chip into one slot" << endl;
cout << "2 - Drop multiple chips into one slot" << endl;
cout << "3 - Quit the program" << endl;
cin >> input;
cout << endl;
if (input == 1)
{
double slot_number;
cout << "Pick a slot (0 - 8) into which you'd like to drop your chip: ";
cin >> slot_number;
cout << endl;
if (slot_number < 0 || slot_number > 8)
{
cout << "INVALID SELECTION" << endl << endl;
}
else if (slot_number >= 0 && slot_number <= 8)
{
double reward = 0;
drop_simulator(slot_number, 1);
cout << "You won $" << reward << "!" << endl;
}
}
else if (input == 2)
{
int number_of_chips_dropped;
cout << "How many chips would you like to drop?" << endl;
cin >> number_of_chips_dropped;
cout << endl;
if (number_of_chips_dropped <= 0)
{
cout << "INVALID SELECTION. Please enter a positive number." << endl << endl;
}
else if (number_of_chips_dropped > 0)
{
double slot_number;
cout << "Pick a slot (0 - 8) into which you'd like to drop your chips.";
cin >> slot_number;
cout << endl;
if (slot_number < 0 || slot_number > 8)
{
cout << "INVALID SELECTION" << endl << endl;
}
else if (slot_number >= 0 && slot_number <= 8)
{
double total_rewards = 0;
for (int i = 0; i < number_of_chips_dropped; i++)
{
total_rewards += drop_simulator(slot_number, 0);
}
double average_winnings = total_rewards / number_of_chips_dropped;
cout << "The average rewards per chip was $" << average_winnings << "." << endl;
cout << "Your total rewards were $" << total_rewards << "." << endl;
}
}
}
else if (input < 1 || input > 3)
{
cout << "INVALID SELECTION. Please enter 1, 2 or 3." << endl << endl;
}
else if (input == 3)
{
cout << "GOODBYE" << endl << endl;
system("pause");
}
}
return 0;
}
答案 0 :(得分：1)
错误消息确实试图告诉问题：
第17行： ran =（ran（）％2）;“明显调用的括号前面的表达式必须具有（指向 - ） - 函数类型”。
这里ran()（parantheses之前的标记）被标记为不是函数或指向函数的类型。
类似
“术语不评估为采用0参数的函数”
表示ran()在当前范围内不知道是声明的函数。
可能您打算在这里使用rand()来获取随机数。
第10行： 函数srand（时间（0））;
参数'：“从'time_t'转换为'unsigned int'，可能会丢失数据”
srand以unsigned int作为参数类型。您正在将time(0)的返回值设为它。这是time_t。 （可能是一种long。）这可能会失去一些精确度（long到int）。由于您可能不关心初始化RNG，您可以使用明确的演员：
srand((unsigned int)time(0));
第99行： drop_simulator（slot_number，1）;
和
第129行： total_rewards + = drop_simulator（slot_number，0）;使
“'参数'：从'double'转换为'int'，可能会丢失数据”
将slot_number定义为double main，而drop_simulator is being declared as的正式参数. As double can represent more values that int, you get the problem indicated. For fixing this you could just change the declaration of slot_number`：
int slot_number;
。
答案 1 :(得分：0)
在第17行（ran = ran（）％2）：“明显调用的括号前面的表达式必须具有（指向 - ）函数类型”。这是什么意思？
这是因为ran不是函数名，您可能想要
ran = rand() % 2
这使得run成为调用函数rand 2的模数的结果。
这将修复第17行的第二个错误。
第99行（drop_simulator（slot_number，1）;）：“'参数'：从'double'转换为'int'，可能丢失数据”。我该如何防止这种情况？
第129行（total_rewards + = drop_simulator（slot_number，0）;）：与上述相同。
这是因为你不必要地将“slot_number”声明为double。这意味着用户可以输入您不想要的值，例如“1.2345”。只需将slot_number的声明从double slot_number更改为int slot_number。
第10行（（srand（time（0））;）：“'argument'：从'time_t'转换为'unsigned int'，可能会丢失数据”。这是什么意思？
这意味着srand需要无符号整数，但time(0)会返回time_t。你可以用cast来解决这个问题：
srand(unsigned int(time(0)));
完整代码：
#include <iostream>
#include <cstdlib>
#include <math.h>
#include <time.h>
using namespace std;
double drop_simulator(int slot_number, int number_of_chips_dropped)
{
srand(static_cast<unsigned int>(time(0)));
double plink;
double ran;
double location;
location = slot_number;
for (int i = 0; i < 12; i++)
{
ran = (rand() % 2);
plink = ran;
plink -= 0.5;
location += plink;
if (location >= 8)
{
location -= 1;
}
else if (location <= 0)
{
location += 1;
}
if (number_of_chips_dropped == 1)
{
cout << location << endl;
}
}
int reward = 0;
if (location == 0)
{
reward = 100;
}
else if (location == 1)
{
reward = 500;
}
else if (location == 2)
{
reward = 1000;
}
else if (location == 3)
{
reward = 0;
}
else if (location == 4)
{
reward = 10000;
}
else if (location == 5)
{
reward = 0;
}
else if (location == 6)
{
reward = 1000;
}
else if (location == 7)
{
reward = 500;
}
else if (location == 8)
{
reward = 100;
}
return reward;
}
int main()
{
int input = 0;
while (input != 3)
{
cout << "Please select one of these three options." << endl;
cout << "1 - Drop a single chip into one slot" << endl;
cout << "2 - Drop multiple chips into one slot" << endl;
cout << "3 - Quit the program" << endl;
cin >> input;
cout << endl;
if (input == 1)
{
int slot_number;
cout << "Pick a slot (0 - 8) into which you'd like to drop your chip: ";
cin >> slot_number;
cout << endl;
if (slot_number < 0 || slot_number > 8)
{
cout << "INVALID SELECTION" << endl << endl;
}
else if (slot_number >= 0 && slot_number <= 8)
{
double reward = 0;
drop_simulator(slot_number, 1);
cout << "You won $" << reward << "!" << endl;
}
}
else if (input == 2)
{
int number_of_chips_dropped;
cout << "How many chips would you like to drop?" << endl;
cin >> number_of_chips_dropped;
cout << endl;
if (number_of_chips_dropped <= 0)
{
cout << "INVALID SELECTION. Please enter a positive number." << endl << endl;
}
else if (number_of_chips_dropped > 0)
{
int slot_number;
cout << "Pick a slot (0 - 8) into which you'd like to drop your chips.";
cin >> slot_number;
cout << endl;
if (slot_number < 0 || slot_number > 8)
{
cout << "INVALID SELECTION" << endl << endl;
}
else if (slot_number >= 0 && slot_number <= 8)
{
double total_rewards = 0;
for (int i = 0; i < number_of_chips_dropped; i++)
{
total_rewards += drop_simulator(slot_number, 0);
}
double average_winnings = total_rewards / number_of_chips_dropped;
cout << "The average rewards per chip was $" << average_winnings << "." << endl;
cout << "Your total rewards were $" << total_rewards << "." << endl;
}
}
}
else if (input < 1 || input > 3)
{
cout << "INVALID SELECTION. Please enter 1, 2 or 3." << endl << endl;
}
else if (input == 3)
{
cout << "GOODBYE" << endl << endl;
system("pause");
}
}
return 0;
}