Thread: Codeblocks project.exe stopped working

I may have mentioned this before, but your indentation needs work.
https://en.wikipedia.org/wiki/Indent_style

Code:

#include<stdio.h>
#define N 10
#define DEBUG 0
#include<time.h>
#include<stdlib.h>
#include<math.h>

int isSafe(int x, int y, int tomb[N][N], int megoldas[N][N])
{
  if (x >= 0 && x < N && y >= 0 && y < N && tomb[x][y] == 1 && !megoldas[x][y])
    return 1;
  else
    return 0;
}

int Keres(int tomb[N][N], int megoldas[N][N], int x, int y)
{
  if (x == N - 1) {
    megoldas[x][y] = 1;
    return 1;
  }
  if (isSafe(x, y, tomb, megoldas) == 1) {
    megoldas[x][y] = 1;
    if (Keres(tomb, megoldas, x, y + 1) == 1)
      return 1;
    if (Keres(tomb, megoldas, x + 1, y) == 1)
      return 1;
    if (Keres(tomb, megoldas, x, y - 1) == 1)
      return 1;
    if (Keres(tomb, megoldas, x - 1, y) == 1)
      return 1;
    megoldas[x][y] = 0;
  }
  return 0;
}

int main()
{
  int probalkozas = 100, atment = 0, ok = 0, i, j, k, ism;
  float p = 0.0;
  float reszatlag[20] = { 0 };
  float atlag = 0;
  float szoras = 0;

  FILE *pFile;
  pFile = fopen("10x10.txt", "a");
  srand(time(0));

  for (int v = 0; v < 10; v++) {
    p = p + 0.1;
    for (int csinald = 0; csinald < 100; csinald++) {
      atment = 0;
      int tomb[N][N] = { {0} };
      int megoldas[N][N] = { {0} };
      for (ism = 0; ism < probalkozas; ism++) {
        for (i = 0; i < N; i++) {
          for (j = 0; j < N; j++) {
            if (rand() % 100 + 1 <= (p * 100))
              tomb[i][j] = 1;
            else
              tomb[i][j] = 0;
          }
        }

        ok = 0;
        for (i = 0; i < N; i++) {
          if (Keres(tomb, megoldas, 0, i) == 1 && ok == 0) {
            ok = 1;
            atment++;
            for (j = 0; j < N; j++) {
              for (k = 0; k < N; k++) {
                megoldas[j][k] = 0;
              }
            }
          }
        }
      }
      reszatlag[csinald] = (float) atment / (float) probalkozas;

      printf("P = %.2f\nTabla kitoltese: %dx\n"
             "Sikeres ateresek szama: %d\n"
             "Sikeres ateresek atlaga: %.4f \n ",
           p, probalkozas, atment, reszatlag[csinald]);
    }

    for (i = 0; i < 100; i++) {
      atlag += reszatlag[i];
    }
    atlag = atlag / 100;

    for (i = 0; i < 110; i++)
      szoras = sqrt(((reszatlag[i] - atlag) * (reszatlag[i] - atlag)) / 20);

    fprintf(pFile, "%.3f %.4f %.4f\n", p * 100, atlag * 100, szoras * 100);
    atlag = 0;
  }
  return 0;
}

> float reszatlag[20] = ...;
You created a #define for N being 10, why not a #define for the other magic numbers in this code, like 20 and 100 ?

Now the killer....

Code:

for (int csinald = 0; csinald < 100; csinald++)
...
reszatlag[csinald] = (float) atment / (float) probalkozas;

The key phrase here is "buffer overrun!!!"