Two counters in a for loop for C#

Question

Hi couldn't find it for C#, I am trying something like that

for (int j = mediumNum; j < hardNum; j++; && int k = 0; k < mediumNum; k++);

but it does not work. Any valid method???

Solution 1

If I am understanding correctly, you want this:

for (int j = mediumNum, k = 0; j < hardNum && k < mediumNum; j++, k++)

Solution 2

It might express your intent better to use a while loop, perhaps making the code a little easier to read:

int j = mediumNum;
int k = 0;
while (j < hardNum && k < mediumNum)
{
    //...
    j++;
    k++;
}

Solution 3

This is what you want

for (int j = mediumNum, k = 0; j < hardNum && k < mediumNum; j++, k++)

Solution 4

I wonder if you know for sure that both loops always terminate at the same time. If not, the body of the loop will have to account for that.

int j;
int k;
for (j = mediumNum, k = 0; j < hardNum && k < mediumNum; j++, k++);

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Comments

[Tony Hopkinson]

I agree, well described intent is much better than jam eveything on to one line.

[Paul Phillips]

@RobertHarvey Yes, although I would probably never use it

[Paul Phillips]

I prefer the while loop for clarity; nesting it on one line is hard to scan.

[David]

@PaulPhillips: The community at large seems to prefer your solution :) Probably because it's kind of clever. I've never seen that comma notation in the loop arguments like that. Can't say I can think of a need for it off the top of my head (though I can't even think of the last time I used for instead of foreach these days), but it's interesting to know it exists.