Forum Debian Users Gang

int main(int argc, char** argv)
{
    using namespace std;
    
    int const N=1000; //wymiar
    float A[N][N],B[N][N],C[N][N]; //macierze 
    for (int i=0;i<N;i++) for(int j=0;j<N;j++) C[i][j] = 0; //tutaj sie wywala. sprawdzilem.
}

./macierze_test
Naruszenie ochrony pamięci

int main(int argc, char** argv)
{
    using namespace std;
    
    int const N=1000; //wymiar
    float A[N][N],B[N][N],C[N][N]; //macierze 
    for (int i=0;i<N;i++) 
        for(int j=0;j<N;j++) 
            C[i][j] = 0; //tutaj sie wywala. sprawdzilem.
}

int main(int argc, char** argv)
{
    using namespace std;
    
    int const N=1000; //wymiar
    float A[N][N],B[N][N],C[N][N]; //macierze 
    for (int i=0;i<N;i++)
    {
        for(int j=0;j<N;j++) 
        {
            C[i][j] = 0; //tutaj sie wywala. sprawdzilem.
        }
    }
}

==1054== Memcheck, a memory error detector.
==1054== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==1054== Using LibVEX rev 1732, a library for dynamic binary translation.
==1054== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==1054== Using valgrind-3.2.3, a dynamic binary instrumentation framework.
==1054== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==1054== For more details, rerun with: -v
==1054==
==1054== Warning: client switching stacks?  SP change: 0x7FF000300 --> 0x7FE227498
==1054==          to suppress, use: --max-stackframe=14519912 or greater
==1054== Invalid write of size 4
==1054==    at 0x400533: main (in /var/home/rbidas/forum)
==1054==  Address 0x7FE22742C is just below the stack ptr.  To suppress, use: --workaround-gcc296-bugs=yes
==1054==
==1054== Process terminating with default action of signal 11 (SIGSEGV)
==1054==  Access not within mapped region at address 0x7FE22742C
==1054==    at 0x400533: main (in /var/home/rbidas/forum)
==1054==
==1054== Invalid write of size 8
==1054==    at 0x48022D8: _vgnU_freeres (vg_preloaded.c:56)
==1054==  Address 0x7FE227490 is on thread 1's stack
==1054==
==1054== Process terminating with default action of signal 11 (SIGSEGV)
==1054==  Access not within mapped region at address 0x7FE227490
==1054==    at 0x48022D8: _vgnU_freeres (vg_preloaded.c:56)
==1054==
==1054== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 5 from 1)
==1054== malloc/free: in use at exit: 0 bytes in 0 blocks.
==1054== malloc/free: 0 allocs, 0 frees, 0 bytes allocated.
==1054== For counts of detected errors, rerun with: -v
==1054== All heap blocks were freed -- no leaks are possible.
Segmentation fault

int main(int argc, char** argv)
{
    using namespace std;

            int const N=100100; //wymiar
                float **A = new float *[N];
                float **B = new float *[N];
                float **C = new float *[N];
                for( int i=0; i<N; ++i )
                {
                    A[i] = new float [N];
                    B[i] = new float [N];
                    C[i] = new float [N];
                }

                for (int i=0;i<N;i++)
                {
                    for(int j=0;j<N;j++)
                    {
                        C[i][j] = 0; //tutaj sie wywala. sprawdzilem.
                    }
                }


}