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draft Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

const

foo() const
no change private variable
foo(const &)
no change the val passed in

class

do not forget ;
class Name(){\\ };
default constr­uctor
Name();
main function arguments
int main(int argc, char* argv[])
error message
if (!inFile) {std::cerr << “ERROR!!” << std::e­ndl;}
class name .h file
Name::­get­Val­ue(){}
read file
ifstream puzzle­Str­(ar­gv[1]);
string puzzle­Line;
vector­<st­rin­g> puzzle­Text;
while (puzzl­eSt­r.g­ood())
{
puzzleStr >> puzzle­Line;
puzzle­Tex­t.p­ush­_ba­ck(­low­er(­puz­zle­Line));
}

Pointers

new
delete( [] ) a;
int * p, q;
p is int pointer, q is int
a[0]
pointer of array a[]
a[i]; all equal to
*(a+i)
array is a pointer
p[3] = *(p+3)
int list[10]; int*p=­list;
p = list[0];
p = &x;
take the address of x to p
*p = 13;
follow the pointer
*p = a; all equal to
p = &a;
Delete an array of pointer
for (int i = 0; i < rows; i++)
delete [] a[i];
delete [] a;

dynamic memory allocation

Automatic memory
allocates space on the stack and stores there
Static memory
They are not eliminated when they go out of scope
Dynamic memory
explicitly allocated (on the heap) as needed
new
new TYPE;
loop delete
only for two heaps;