using Vectors insteard of Two dimentional arrays...

[pra1983]

Can any one tell me how to use vectors insteard of two dimensional arrays...

I was trying to store some thousands of values in an aray but i gives me error in between saying that
" Stack is out of order in so and so ............... memory location "


so i tried to use vectors.....

[Savage]

Can any one tell me how to use vectors insteard of two ...


so i tried to use vectors.....

How?

Savage

[Ganon11]

[CODE=cpp]vector< vector<yourType > > myVec;[/CODE]

Note the spaces! They are very important.

[pra1983]

[CODE=cpp]vector< vector<yourType > > myVec;[/CODE]

Note the spaces! They are very important.

how can i enter data into that vec . and how can i access the data from the vec after filling in it.

[Ganon11]

Well, myVec is a vector, so you will just use push_back on it. But myVec is a vector holding vectors. So you need to push_back a vector onto myVec. So the way to add data to myVec is to build a temporary vector with any data you want, and then push_back this vector.

Once you have built the vector of vectors, access data just like you would a 2-dimensional array.

[pra1983]

reply

Well, myVec is a vector, so you will just use push_back on it. But myVec is a vector holding vectors. So you need to push_back a vector onto myVec. So the way to add data to myVec is to build a temporary vector with any data you want, and then push_back this vector.

Once you have built the vector of vectors, access data just like you would a 2-dimensional array.

vec ---- vector in vector
vec1----- vector which is pushedback into vec
I am pushing back different size vec1's into vec. can u tell me how to check the length or size of each vector in 'vec' while accessing 'vec'.

[Ganon11]

[CODE=cpp]vec[i].length()[/CODE]

Any member in vec (vec[i] is a vector, and so it has a .length() function.

[pra1983]

[CODE=cpp]vec[i].length()[/CODE]

Any member in vec (vec[i] is a vector, and so it has a .length() function.

how to clear the elements of the vector which has elements.

if in previous i have

vect=0 1 2 3 4 5 6
i need to rewrite the vect to
vect= 7 8 9 10 11 12

but it is getting added up like

vect= 1 2 3 4 5 6 7 8 9 10 11 12......

how to clear the vector
i am using ".empty()" vector.. should i keep it in loop.....

[Savage]

how to clear the elements of the vector which has elements.

if in previous i have

vect=0 1 2 3 4 5 6
i need to rewrite the vect to
vect= 7 8 9 10 11 12

but it is getting added up like

vect= 1 2 3 4 5 6 7 8 9 10 11 12......

how to clear the vector
i am using ".empty()" vector.. should i keep it in loop.....

empty is a bool function which checks if vector is empty,if you want to delete the elements use erase instead.

Savage

[Ganon11]

pra1983:

You keep coming back here to ask more and more simple questions about vectors. Try looking at some of its documentation at www.cplusplus.com. Many, if not all, of your questions can be answered between this website and a little trial and error on your part.

[pra1983]

pra1983:

You keep coming back here to ask more and more simple questions about vectors. Try looking at some of its documentation at www.cplusplus.com. Many, if not all, of your questions can be answered between this website and a little trial and error on your part.

I got that but it is giving me an error sayig that

"Microsoft Visual Studio
Unhandled exception at 0x00000000 in project2.exe: 0xC0000005:
Access violation reading location 0x00000000
BREAK CONTINUE ."


I got this so I swiched from two dimensional arrays to vectors.
but in vectors also i am getting the same error .....
can any one resolve this error.....