Compilare: user.c: In function ‘main’: user.c:80:2: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration] close(fin); ^ user.c: In function ‘print_values’: user.c:17:9: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:19:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:24:11: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:29:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:32:11: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c: In function ‘read’: user.c:49:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:51:8: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:54:8: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:56:9: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:59:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^ user.c:63:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, sizeof(char), fin); ^