Thread: Segmentation fault with a file pointer?

Please scroll down to my last post!!

I am compiling sucessfully using gcc 3.3 but on running my program seg faults. I have isolated the problem as being to do with an fprintf line which is fine if I replace fptr with stdout, so I think my fopen line is wrong...

here is a summary of every line containing fptr as graciously supplied by grep:

Code:

18-  double x, *cumulative;
19:  FILE *fptr;
20-
--
31-  m = (int) strtol ( argv[2], NULL, 10 );
32:  fptr = fopen ( argv[3], "w" );
33:  if ( fptr == NULL ) {
34-    printf ( "Unable to open \"%s\" to write.\n", argv[3] );
--
155-	fprintf ( stdout, "%d\t%d\t%d\n", i+1, j+1, adjacency[i][j] );
156:        fprintf ( fptr, "%d\t%d\t%d\n", i+1, j+1, adjacency[i][j] );
157-      }
--
161-
162:  fclose(fptr);
163-  return 0;