Unhandled exception

[DaliaMadkour]

HI all,
when i run this code i get error message said
"Unhandled exception at 0x012D9116 in prog.exe: 0xC0000005: Access violation reading location 0x0126E710." and the prog stop running.
Note: in main(), and when i remove the loop, prog executed properly.
can you help me?

char x1[50][50][50];
unsigned x2[3][50][50];

void fn1(){
	unsigned* x3= new unsigned[50];
        //...
        //...
       delete [] x3;
}
void fn2(){
        int i,j;
	double *x4= new double[50];
	char*** x5;
	x5=new char**[50];
	for (i = 0; i < 50; ++i) {
		x5[i] = new char*[50];
		for (j = 0; j < 50 ; ++j)
			x5[i][j] = new char[50];}

	// ...
        //...

	delete[] x4;
	for (i = 0; i < 50; ++i) {
		for ( j = 0; j < 50; ++j)
			delete [] x5[i][j];
		delete [] x5[i];
	}
	delete [] x5;
}
int main(){
int i=100;
while (i--)
{
fn1();
fn2();
}
retrn 0;
}

[Peter87]

The problem is probably somewhere in the code you haven't posted.

[DaliaMadkour]

yes, yes, i found that i tried to access x3[-99] in fun1() :D :D in the sec loop iteration of main.

thanks a lot,
i'll trying to fix the problem and ask again.

greetings.

[DaliaMadkour]

hi again,
if i have this code in fn2()

for(i=0; i<50; i++)
		for(x=0 ; x<lengthM;x++)
			for(y=0; y<widthM ;y++)
				x1[i][x][y]=x5[i][x][y];

is there any way to directly change x1 addresse and make it points to x5?

[ne555]

No.
1_ Use std::swap() with std::vector
A_ Maintain both matrix, select with a pointer
\alpha_ Construct directly in `x1'

¿why so much abuse with dynamic allocation?

[DaliaMadkour]

okay, thanks.

it's in real genetic algorithm implementation(multi-objective land use allocation problem),and i always have run out of memory, because of the large size of the chromosome.

*actually now i use:

char x1[50][50][50];
unsigned x2[3][50][50];

void fn1(){
	unsigned* x3= new unsigned[50];
        //...
        //...
       delete [] x3;
}
void fn2(){
        int i,j;
	double *x4= new double[50];
	char x5[50][50][50];

	// ...
        //...
        delete [] x4;
}
int main(){
int i=100;
while (i--)
{
fn1();
fn2();
}
retrn 0;
}