Compilare: user.cpp: In function ‘int main()’: user.cpp:25:5: warning: unused variable ‘n’ [-Wunused-variable] int n,i,a, b, c; ^ user.cpp:25:7: warning: unused variable ‘i’ [-Wunused-variable] int n,i,a, b, c; ^ user.cpp:25:15: warning: unused variable ‘c’ [-Wunused-variable] int n,i,a, b, c; ^ user.cpp:30:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d", &a, &b); ^