Compilare: user.c: In function ‘main’: user.c:9:9: warning: variable ‘out’ set but not used [-Wunused-but-set-variable] FILE * out; ^ user.c:15:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:20:8: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:26:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:30:11: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:35:12: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:45:12: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:57:8: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:63:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:67:11: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:72:12: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^ user.c:82:12: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c,1,1,f); ^