#Does order of incrementing/decrementing multiple variables matter in for loops?

1 messages · Page 1 of 1 (latest)

worthy notch
#

So I was trying to solve N-Queen's problem using java and tried to use

for (int r = row, c = col; r >= 0 && c < board.length; r--, c++) {
    // Loop body
}

which according to me should check the upper right diagonal, but for some reason my solution was producing weird output and I checked some solutions where they have used

for (int r = row, c = col; r >= 0 && c < board.length; c++, r--) {
    // Loop body
}

So that got me to wonder does this order of c++, r-- in the for loop matters? If yes, how exactly?

quasi hingeBOT
#

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clear canopy
#

No the order of incrementation does not matter. It also doesn't matter if you use ++c instead of c++

#

The order would only matter if one variable is dependent on another.
For example:

for (int r = 10, c = 0; r >= 0; r-=c, c++) //6 iterations
for (int r = 10, c = 0; r >= 0 ; c++, r-=c) //5 iterations
worthy notch
#

and tbh I didn't really understood his point

#

if we are doing c++ how can we go left. it just doesn't make any sense

clear canopy
#

The movement described is an upwards right diagonal. Regardless of the order of incrementation because the variables are not dependant on one another

worthy notch
#

thanks!

quasi hingeBOT
# worthy notch thanks!

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