Compilare: user.cpp: In function ‘void create_text()’: user.cpp:130:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(txt); ++ i) ^ user.cpp: In function ‘void read()’: user.cpp:136:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(txt); ^ user.cpp:139:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &k); ^ user.cpp:142:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(w); ^ user.cpp: In function ‘void events()’: user.cpp:166:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &ne); ^ user.cpp:169:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:172:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %c %d %d", &pos, &c, &a, &b); ^ user.cpp:180:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &pos, &idx, &a, &b); ^ /tmp/ccUJ3wZ3.o: In function `read()': user.cpp:(.text+0x777): warning: the `gets' function is dangerous and should not be used.