How I can solve this genetic algorithm (GA) problem? [REPOST]

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Hello :) I have homework for genetic algorithm. I've created a 20x20 array of 0 and 1s and I've counted how many 1s in a row. After this stage, I could not progress. Please help me:)
I want to pick two random row and compare. After this stage whichever is have more 1 it will be selected. I want this step to be repeated twice.
After this step I want to crossover two chromosomes and I want to get a new chromosome.

This is my code;

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 20 
int main()
{
 int a[SIZE];
 int i, j, x;
 int counter;
 
 srand(time(NULL));
 
for(x=0; x<SIZE; ++x){ // run code 20 times
	printf("\n");
 
 for (j = 0; j < SIZE; ++j) {
  a[j] = rand() % 2;//Random 0 and 1
  printf("%2d", a[j]);
 }
printf("\n");
  for (i = 0; i < SIZE; ++i) {
     counter = 0;//Counter is reset in every cycle
  for (j = 0; j < SIZE; ++j)
   if (a[j] == 1)
    ++counter;//Counter increases one's value for every 1 he sees
 }
printf("ChromozomeHaveOnes = %d", counter);
printf("\n");
}
 return 0;
}

What I have tried:

I tried some genetic algorithm codes but I can't solve it. I want to pick two random row and compare. After this stage whichever is have more 1 it will be selected. I want this step to be repeated twice.
After this step I want to crossover two chromosomes and I want to get a new chromosome.

Posted 18-Apr-19 0:29am

User 14282016

Updated 18-Apr-19 9:44am

Dave Kreskowiak

v3

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OriginalGriff · Accepted Answer · 2019-04-18T00:50:00

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:

Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16

Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:

C#

int Double(int value)
   {
   return value * value;
   }

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!

CPallini · Accepted Answer · 2019-04-18T01:22:00

I order to make operations (e.g. compare rows) with your data, you should store it (your code overwrites the same array).
Try, as a starting point

C

#include <stdio.h>
#include <stdlib.h>
#define SIZE 20 

void init(int a[SIZE][SIZE], int sum[SIZE]);
void dump(int a[SIZE][SIZE], int sum[SIZE]);

int main()
{
  int a[SIZE][SIZE];  // rows & cols...
  int sum[SIZE]; // count of ones of every row
  init(a, sum);
  dump(a, sum);
  return 0;
}

void init(int a[SIZE][SIZE], int sum[SIZE])
{
  int i,j;
  for (i=0; i<SIZE; ++i)
  {
    sum[i] = 0;
    for(j=0; j<SIZE; ++j)
    {
      a[i][j] = rand() % 2;
      sum[i] += a[i][j];
    }
  }
}
void dump(int a[SIZE][SIZE], int sum[SIZE])
{
  int i,j;
  for (i=0; i<SIZE; ++i)
  {
    for(j=0; j<SIZE; ++j)
      printf("% 2d", a[i][j]);
    printf(" sum = %d\n", sum[i]);
  }
}

How I can solve this genetic algorithm (GA) problem? [REPOST]

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