foolish compiler?!

[hooshdar3]

hi.
Why is it that zero (0) is output after running

.........
      k=1;
      i=1;
    for(;i<201;++i)  
     for(;k<201;++k)
      A[i][k]=1000000;  
cout<<A[112][23];   
...................

[aquavillan]

At line 5, change for(;k <= 201 to for(k = 1;k <= 201

Now the code should work, see explanation below. Sorry for what I have said earlier.

[Jaybob66]

inner loop will only run once, next time round k==201 already because it wasnt reset.

.........
     // k=1;
     // i=1;
    for(i=1;i<201;++i)        <<< init i
     for(k=1;k<201;++k)    <<< init k
      A[i][k]=1000000;  
cout<<A[112][23];   
...................

[hooshdar3]

Why just once?
Weren't they initialized outside the loop?

[MikeyBoy]

Think about what value k will have at the end of the first time your inner loop runs (when i is 1).

Think about what value k will have at the start of the second time your inner loop runs (when i is 2).

Think about how many times your inner loop will run when i is 2.

[Jaybob66]

Weren't they initialized outside the loop?

yes, but they should have been initialised outside "their own" loops, which would put k's initialisation INSIDE i's loop.