Floating point exception core dump

Question

Program  So I made a program that take two numbers  N and L  N is the size of a 2D array and L is a number from 3 - 16  The program builds the array and starts at the center and works its way out in a counter clockwise spiral  I is the value of the center and its as you go through the array  in the spiral   the value will increase by one  It it is prime  that number will be assigned to that spot and if not it   will take its place instead   Error  I m getting a  Floating point exception   error  how would I solve this    Code    void Array Loop  int  Array  int n  int L      int Is Prime  int Number      int main  int argc  char  argv         int   Array     int n  L      n   atoi  argv 1        L   atoi  argv 2         Matrix Build   amp Array  n  n       Array Loop  Array  n  L         return 0       void Array Loop  int  Array  int n  int L       int i  j  k  h     int lctn  move     lctn   n   2   1     i   lctn     j   lctn     move   1    while  i    0  amp  amp  j    n         for  j   lctn   j  lt  lctn   move   j                if  L   2    2  Array i  j    -1            else Array i  j    Is Prime  L              L                move   move   -1        for  i   i   i  gt  lctn - move   i--           if  L   2    2  Array i  j    -1         else Array i  j    Is Prime  L           L                move--        for  j   j   j  gt  lctn - move   j--           if  L   2    2  Array i  j    -1         else Array i  j    Is Prime  L           L                move   move   -1        for  i   i   i  lt  lctn - move   i--           if  L   2    2  Array i  j    -1         else Array i  j    Is Prime  L           L                move               int Is Prime  int Number       int i      for  i   0   i  lt  Number   2   i           if  Number   i    0   return -1           return Number

User · Accepted Answer

You are getting Floating point exception because Number % i, when i is 0:

int Is_Prime( int Number ){

  int i ;

  for( i = 0 ; i < Number / 2 ; i++ ){

    if( Number % i != 0 ) return -1 ;

  }

  return Number ;

}

Just start the loop at i = 2. Since i = 1 in Number % i it always be equal to zero, since Number is a int.

User · Answer

Floating Point Exception happens because of an unexpected infinity or NaN  You can track that using gdb  which allows you to see what is going on inside your C program while it runs  For more details   https   www cs swarthmore edu  newhall unixhelp howto gdb php  In a nutshell  these commands might be useful     gcc -g myprog c  gdb a out  gdb core a out  ddd a out

[c] Floating point exception( core dump

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