[英]Buffer overrun warning
此腳本將數字的所有數字展開到一個數組中,因此通過執行此操作: spread(number)[position]
您可以訪問具有相對位置的數字。 現在編譯器給了我一個Buffer overrun
警告 (C6386),我認為這是由超出數組邊界引起的(如果我錯了,請糾正我),但我編寫了函數腳本,這樣這樣的事情就不會發生,程序仍然出現故障
#include <iostream>
#include <math.h>
using namespace std;
unsigned int size(long long int num)
{
unsigned int size = 1;
while (num >= pow(10, size)) size++;
return size;
}
int* spread(int num)
{
unsigned int digit;
int* nums = new int[size(num)];
for (unsigned int P = 0; P <= size(num) - 1; P++)
{
digit = num - num / 10 * 10;
num /= 10;
nums[P] = digit; //Right in this line the program doesn't seem to behave correctly
}
return nums;
}
int main()
{
cout << split(377)[0] << endl;
cout << split(377)[1] << endl;
cout << split(377)[2] << endl;
system("PAUSE");
return 0x0;
}
/*
Output of the program:
7
7
-842150451 <-- there should be a 3 here
Press any key to continue . . .
*/
for 循環的主體會干擾您的結束條件:
解決方法是size(num)
計算size(num)
並在循環條件中使用它:
int numdigits = size(num);
for (int P=0; P < numdigits; P++) { ... }
{
unsigned int digit;
int* nums = new int[size(num)];
int P = 0;
while(num!=0)
{
digit = num - num / 10 * 10;
num /= 10;
nums[P++] = digit; //Right in this line the program doesn't seem to behave correctly
}
return nums;
}
您將存儲數字直到數字為 0。使用此條件,您的代碼將起作用。 但是你有內存泄漏......你必須釋放動態內存!
更新:有一個短代碼,可以工作;-)
#include <iostream>
#include <vector>
#include <string>
using namespace std;
vector<size_t> spread(int const num)
{
string number = to_string(num);
vector<size_t> digits;
for(size_t i = 0; i < number.size(); ++i)
{
digits.push_back(number[i] - '0');
}
return digits;
}
int main()
{
auto vec = spread(12345000);
for (auto elem : vec)
{
cout << elem << endl;
}
system("PAUSE");
return 0x0;
}
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