for loop question [newbie]

Programming Questions

bittt0r

in Programming Questions • 3 years ago

Hi,

I'm trying to reduce this block into a more "elegant" one:

for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][10] == 1) {
dotMatrix[o][190] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][30] == 1) {
dotMatrix[o][170] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][50] == 1) {
dotMatrix[o][150] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][70] == 1) {
dotMatrix[o][130] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][90] == 1) {
dotMatrix[o][110] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][110] == 1) {
dotMatrix[o][90] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][130] == 1) {
dotMatrix[o][70] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][150] == 1) {
dotMatrix[o][50] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][170] == 1) {
dotMatrix[o][30] = 1;
}
}
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][190] == 1) {
dotMatrix[o][10] = 1;
}
}

Like this one, which by the way does not work...

for (int y = 10; y <= 190; y = y+20) {
for (int z = 190; z >= 10; z = z-20) {
if (dotMatrixSave[y][y] == 1) {
dotMatrix[y][z] = 1;
}
}
}

I'm sure the solution is very simple, but I haven been able to fix it.

Any help will be welcomed....

Thanks.

Replies(5)

guy_yitzh..

Re: for loop question [newbie]

3 years ago

It is hard to test without the full source code, but I think this is what you are looking for

for (int i = 10; i <= 190; i+=20) {
for (int o = 10; o <= 190; o = o+20) {
if (dotMatrixSave[o][i] == 1) {
dotMatrix[o][190-i+10] = 1;
}
}
}

bittt0r

Re: Re: for loop question [newbie]

3 years ago

thanks... it worked perfectly.

bblochl

Re: for loop question [newbie]

3 years ago

Please have a look at http://sscce.org/ and next time send a

Short, Self Contained, Correct (Compilable), Example

Anothe solution to your problem might be:

for (int o = 10; o < width; o += 20) {
for (int p = 30; p <= height; p += 20) {
println(" o = " + o + " p = " + p);
          if (dotMatrixSave[o][p] == 1) {
              dotMatrix[o][190-p] = 1;
          }
}

bittt0r

Re: Re: for loop question [newbie]

3 years ago

ok, thanks.

PhiLho

Re: Re: for loop question [newbie]

3 years ago

Hey, I didn't know this SSCCE site! Nice one, focusing on content rather than looks...

And useful, it summarizes what I tend to repeat in programming forum: shortening a code to be self-contained often helps in pinning out the root issue...
Although the issue here was precisely the trouble to shorten the code...

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