c++ - 如何解决 C++ 中的这个运行时错误？ - "Stack around variable was corrupted"

Question

我尝试获取 two integers 的最小值 , real numbers , strings ，和integer arrays通过实现与函数重载获得类似处理结果的函数。

所以我写这样的代码

#include <iostream>  
#include <cstring>    
using namespace std;  

int GetMin(int a, int b);
double GetMin(double a, double b);
char* GetMin(char* a, char* b);
int GetMin(int* arr, int size);


int main()
{
  int num1, num2;
  double num3, num4;
  char s1[30], s2[30];
  int arr[10];

  cout << "Enter two integers : ";
  cin >> num1 >> num2;
  cout << "The minimum value is " << GetMin(num1, num2) <<"\n";

  cout << "Enter two real numbers : ";
  cin >> num3 >> num4;
  cout << "The minimum value is " << GetMin(num3, num4) <<"\n";

  cout << "Enter two strings : ";
  cin >> s1 >> s2;
  cout << "The minimum value is " << GetMin(s1,s2) <<"\n";

  cout << "Elements of an Array : ";
  cin >> arr[10];
  cout << "The minimum value is " << GetMin(arr[10], 10);


}


int GetMin(int a, int b)
{
  if (a > b) return b;
  else return a;


}


double GetMin(double a, double b)
{
  if (a > b) return b;
  else return a;

}


  char* GetMin(char* a, char* b)
{
    if (strcmp(a, b) < 0) return a; 

}


  int GetMin(int* arr, int size)
{
    int min = arr[0];
    for (int i = 1; i<size; i++)
        if (arr[i] < min)
            min = arr[i];
    return min;

}

这是所需的结果。

Enter two integers : 10 20 
The minimum value is 10
Enter two real numbers : 56.84 120.26
The minimum value is 56.84
Enter two strings : orange apple
The minimum value is apple
Elements of an Array : 41 67 34 25 0 54 98 21 58 62
The minimum value is 0

我收到此错误消息。

Run-Time Check Failure #2 - Stack around the variable 'arr' was corrupted.

Answer 1

使用cin给整个数组赋值是错误的。更常见的方法是使用 for 或 while 结构。我建议您阅读此issue了解输入和输出。

此外，您是否在程序中观察到警告？

Warning C6201 Index '10' is out of valid index range '0' to '9' forpossibly stack allocated buffer 'arr'.

数组arr[10]的索引应该是arr[0]~arr[9]。关于C6385，您应该阅读此document .

char* GetMin(char* a, char* b)
{
    if (strcmp(a, b) < 0) return a;

}

最好不要使用函数的参数作为返回值。常见的方法是定义一个变量来存储要返回的参数。