Compilare: user.cpp: In function ‘int main()’: user.cpp:115:9: warning: unused variable ‘m’ [-Wunused-variable] int m,i,q,a,b,c,bit,j,x,x1,y1,x2,y2,dad1,dad2; ^ user.cpp:115:15: warning: unused variable ‘a’ [-Wunused-variable] int m,i,q,a,b,c,bit,j,x,x1,y1,x2,y2,dad1,dad2; ^ user.cpp:115:17: warning: unused variable ‘b’ [-Wunused-variable] int m,i,q,a,b,c,bit,j,x,x1,y1,x2,y2,dad1,dad2; ^ user.cpp:115:19: warning: unused variable ‘c’ [-Wunused-variable] int m,i,q,a,b,c,bit,j,x,x1,y1,x2,y2,dad1,dad2; ^ user.cpp: In function ‘void read(int&)’: user.cpp:99:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp:107:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:113:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice2.in","r",stdin); ^ user.cpp:114:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice2.out","w",stdout); ^ user.cpp:116:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^