Compilare: user.cpp: In function ‘int main()’: user.cpp:31:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1; i<strlen(s); i++) ^ user.cpp:11:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.in","r",stdin); ^ user.cpp:12:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.out","w",stdout); ^ user.cpp:13:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%c",&m,&n,&z); ^ user.cpp:20:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&z); ^ user.cpp:27:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&z); ^ user.cpp:29:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); lin[1]=X; col[1]=Y; ^ user.cpp:29:40: warning: ‘Y’ may be used uninitialized in this function [-Wmaybe-uninitialized] gets(s); lin[1]=X; col[1]=Y; ^ user.cpp:29:30: warning: ‘X’ may be used uninitialized in this function [-Wmaybe-uninitialized] gets(s); lin[1]=X; col[1]=Y; ^ /tmp/cc3n8LlB.o: In function `main': user.cpp:(.text.startup+0x185): warning: the `gets' function is dangerous and should not be used.