C++ C++；

我只是在写简单的代码，然后我看到了一些奇怪的东西。代码应该将一个字符串附加到另一个字符串。新附加字符串的输出不仅输出正确的附加字符串，而且每增加四次数字2，我不明白为什么。我以为是我忽略了什么内存泄漏之类的，但它每次都输出相同的四个数字

代码：

---

你错过了零：

#include <iostream>

using namespace std;
unsigned int getStrSize(const char* string)
{
    unsigned int size = 0;
    while (string[size] != '\0')
    {
        size++;
    }
    return size;
}

int main()
{
    const char* bla1 = "hello";
    const char* bla2 = " blaah";

    int size1 = getStrSize(bla1);
    int size2 = getStrSize(bla2);
    int size12 = size1 + size2 + 1; // notice +1

    char* bla12 = new char[size12];

    for (int i = 0; i < size1; i++)
    {
        bla12[i] = bla1[i];
    }
    for (int i = 0; i < size2; i++)
    {
        bla12[i + size1] = bla2[i];
    }
    bla12[size12 - 1] = '\0'; // terminate with nil
    char* blaNew = bla12;

    cout << bla1 << "\n";
    cout << bla2 << "\n";
    cout << bla12 << "\n";
    cout << blaNew << "\n";

    delete[] bla12;  // Don't leak memory
    delete[] blaNew; // 
}

#包括
使用名称空间std；
无符号整型getStrSize（常量字符*字符串）
{
无符号整数大小=0；
while（字符串[大小]！='\0'）
{
大小++；
}
返回大小；
}
int main（）
{
const char*bla1=“你好”；
const char*bla2=“blaah”；
int size1=getStrSize（bla1）；
int size2=getStrSize（bla2）；
int size12=size1+size2+1；//注意+1
char*bla12=新字符[size12]；
对于（int i=0；icout问题是您没有空终止您的char*缓冲区。
std:：cout.operatorNah我想构建自己的字符串，不依赖任何标准库函数。
hello
 blaah
hello blaah²²²²
hello blaah²²²²

#include <iostream>

using namespace std;
unsigned int getStrSize(const char* string)
{
    unsigned int size = 0;
    while (string[size] != '\0')
    {
        size++;
    }
    return size;
}

int main()
{
    const char* bla1 = "hello";
    const char* bla2 = " blaah";

    int size1 = getStrSize(bla1);
    int size2 = getStrSize(bla2);
    int size12 = size1 + size2 + 1; // notice +1

    char* bla12 = new char[size12];

    for (int i = 0; i < size1; i++)
    {
        bla12[i] = bla1[i];
    }
    for (int i = 0; i < size2; i++)
    {
        bla12[i + size1] = bla2[i];
    }
    bla12[size12 - 1] = '\0'; // terminate with nil
    char* blaNew = bla12;

    cout << bla1 << "\n";
    cout << bla2 << "\n";
    cout << bla12 << "\n";
    cout << blaNew << "\n";

    delete[] bla12;  // Don't leak memory
    delete[] blaNew; // 
}

#include <cstring>
#include <iostream>

int main() {
  const char* bla1 = "hello";
  const char* bla2 = " blaah";

  auto const size1 = std::strlen(bla1);
  auto const size2 = std::strlen(bla2);
  auto const size12 = size1 + size2 + 1;

  char* bla12 = new char[size12];

  std::strcpy(bla12, bla1);
  std::strcat(bla12, bla2);
  char* blaNew = bla12;

  std::cout << bla1 << "\n";
  std::cout << bla2 << "\n";
  std::cout << bla12 << "\n";
  std::cout << blaNew << "\n";

  delete[] bla12;
  delete[] blaNew;
}