Compilare: user.cpp: In function ‘int main()’: user.cpp:87:32: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] masina[p+1]=NULL; ^ user.cpp:96:24: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] masina[p+1]=NULL; ^ user.cpp:110:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<in_file[i].size();j++){ ^ user.cpp:72:30: warning: unused variable ‘q’ [-Wunused-variable] int n,a,r,k,i,j,l,p,nr=0,q,dad1,dad2,nrd=0; ^ user.cpp:70:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("showroom.in","r",stdin); ^ user.cpp:71:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("showroom.out","w",stdout); ^ user.cpp:74:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d\n",&n,&a,&r,&k); ^ user.cpp:77:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/cc5lYHlU.o: In function `main': user.cpp:(.text.startup+0xb8): warning: the `gets' function is dangerous and should not be used.