1

此代码编译并运行,但给出了我无法修复的 Microsoft 编译器错误

警告 C4700:使用了未初始化的局部变量 ''。

这是在代码的最后一行,我想

#include <iostream>
using namespace std;

const int DIM0 = 2, DIM1 = 3, DIM2 = 4, DIM3 = 5;

void TestDeclar();

int main(){
    TestDeclar();
    cout << "Done!\n";
    return 0;
}

void TestDeclar(){        
    //24 - array of 5 floats
    float xa[DIM3], xb[DIM3], xc[DIM3], xd[DIM3], xe[DIM3], xf[DIM3];
    float xg[DIM3], xh[DIM3], xi[DIM3], xj[DIM3], xk[DIM3], xl[DIM3];   
    float xm[DIM3], xn[DIM3], xo[DIM3], xp[DIM3], xq[DIM3], xr[DIM3];
    float xs[DIM3], xt[DIM3], xu[DIM3], xv[DIM3], xw[DIM3], xx[DIM3];

    //6  - array of 4 pointers to floats
    float *ya[DIM2] = {xa, xb, xc, xd}, *yb[DIM2] = {xe, xf, xg, xh};   
    float *yc[DIM2] = {xi, xj, xk, xl}, *yd[DIM2] = {xm, xn, xo, xp};
    float *ye[DIM2] = {xq, xr, xs, xt}, *yf[DIM2] = {xu, xv, xw, xx};

    //2 - array of 3 pointers to pointers of floats
    float **za[DIM1] = {ya, yb, yc};    
    float **zb[DIM1] = {yd, ye, yf};

    //array of 2 pointers to pointers to pointers of floats
    float ***ptr[DIM0] = {za, zb};   
    cout << &***ptr[DIM0] << '\n';  
}
4

2 回答 2

3

您正在访问超过ptr4D. DIM0是 2,比最后一个索引 1 大一个!

将最后几行更改为:

//array of 2 pointers to pointers to pointers of floats
float ***ptr4D[DIM0] = {za, zb};   
cout << &***ptr4D[0] << '\n';  
于 2012-10-13T03:33:05.913 回答
0

不确定我是否可以帮助你,但我试图找出在我的 linux 机器上运行它的问题。我已经在 ubuntu 机器上对其进行了编译以进行比较,结果一切正常,甚至告诉编译器打开所有选项警告(通过 -Wall 选项)。运行时,我得到了这个:

# Compiled it with -Wall to enable all warning flags and -g3 to produce extra debug information
~$ g++ -Wall stackoverflow.cpp -g3
./a.out 
Segmentation fault (core dumped)

然后我尝试用 GDB(GNU 调试器)调试它并得到了这个:

(gdb) r
Starting program: /home/ubuntu/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x0000000000400986 in TestDeclar () at stackoverflow.cpp:34
34          cout << &***ptr4D[DIM0] << '\n';  
(gdb) s

所以看来问题出在 cout 线上。再次检查您的代码,DIM0的值为2,因此您正在尝试访问 ptr4D 之外的内存地址。正如user1721424提到的,只需将DIM0替换为0即可!

#After fixing it:
~$ ./a.out 
0x7fff74cd3830
Done!

希望能帮助到你!

于 2012-10-13T03:36:35.410 回答