c++ - 动态数组分配随机崩溃

Question

我一直在努力学习指针和在运行时分配空间。我决定将我的一项旧作业(天气温度数组)更改为动态分配的数组。我想我快完成了，但每次我运行它并输入温度时，我的程序都会在没有警告的情况下崩溃。我想了解它崩溃的原因。

int dayNumber;
double fahrenheit = 0;
double cTemperature = 0;
const double MAXIMUM_TEMPERATURE = 60;// constants for mix/max
const double MINIMUM_TEMPERATURE = -90 ;
const int MAXIMUM_DAYS = 365;
const int MINIMUM_DAYS = 1;
double *ptrTemperatures;

cout << "How many days would you like to enter? ";
dayNumber = myValidation::GetValidInteger(MINIMUM_DAYS, MAXIMUM_DAYS);
try
{
    double *ptrTemperatures = new double[dayNumber];
}
catch(exception e)
{
    cout << "Failed to allocate memory: " << e.what() << endl;
}
cout << "\n\nTEMPERATURE REPORTER\n____________________________\n Please Enter the temperature for each day.";

for(int dayCount = 0; dayCount < dayNumber; dayCount++){
    cout << "Celsius Temperature for Day " << (dayCount + 1) << ": ";
    ptrTemperatures[dayCount] = myValidation::GetValidDouble(MINIMUM_TEMPERATURE, MAXIMUM_TEMPERATURE);
}





delete[] ptrTemperatures;
return 0;

Answer 1

您应该按如下方式更改您的分配:

try
{
   ptrTemperatures = new double[dayNumber];
}