Compilare: user.cpp: In function ‘int vf(int, int)’: user.cpp:103:9: warning: unused variable ‘c1’ [-Wunused-variable] int c1=0,c2=0,c=0,k; ^~ user.cpp:103:14: warning: unused variable ‘c2’ [-Wunused-variable] int c1=0,c2=0,c=0,k; ^~ user.cpp:103:23: warning: unused variable ‘k’ [-Wunused-variable] int c1=0,c2=0,c=0,k; ^ user.cpp: In function ‘unsigned int getint()’: user.cpp:23:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:28:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^