Compilare: user.cpp: In function ‘void Read(int&, int&, int&, int&)’: user.cpp:38:10: warning: unused variable ‘nr’ [-Wunused-variable] { int j,nr=0,c[5]; ^ user.cpp: In function ‘int main()’: user.cpp:61:9: warning: unused variable ‘j’ [-Wunused-variable] { int i,j,xa,ya,xb,yb,res; ^ user.cpp:62:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&t,&p); ^ user.cpp:66:17: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(sir,2,f); ^ user.cpp:67:24: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir,800003,1,f); ^