Compilare: user.cpp: In function ‘int main()’: user.cpp:319:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:319:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘void read(int&, int&)’: user.cpp:18:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%c%d%c",&n,&c,&m,&d); ^ user.cpp:27:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:54:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^