Error

can any one give me the resoan of unhandeled exception error message?????????

1)The most common reason is a read/write in a zone of memory where you
should'nt do that(when you go out of the bounds of a array for example or a crazy memcpy)...
2) The second most common reason is a divsion by zero

What does exactly your message say?

Ehrs

i have four for loop .....

int a[256][256],b[8][8];

for(int i=0;i<256;i+=8)
{
for(int j=0;j<256;j+=8)
{
for(int x=i;x<(i+8);x++)
{
for(int y=j;y<(j+8);y++)
{
b[x][y]=a[x][y];
cout<<b[x][y]<<"\t";
}
cout<<endl;
}
}
cout<<endl;
}

when i run this program it gives me unhandeled exception>>>>>

I don't know what you are doing, but you are accessing your b array beyond its boundary, meaning a memory error. For example:
your for(int x=i;x<(i+8);x++), when i > 8, you will access b beyond its bounds.