Compilare: user.c:46:6: warning: return type of ‘main’ is not ‘int’ [-Wmain] void main(){ ^ user.c: In function ‘main’: user.c:52:9: warning: variable ‘abc’ set but not used [-Wunused-but-set-variable] int abc; ^ user.c:49:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd %hd %hd\n" , &n , &l , &u ); ^ user.c:55:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd\n" , &data[0][n] ); ^ user.c:58:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fi , "%hd" , &data[1][n] ); ^