Compilare: user.cpp: In function ‘int main()’: user.cpp:21:8: warning: unused variable ‘i’ [-Wunused-variable] int T,i = 0,a,b,c,d,x,y; ^ user.cpp:22:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&T); ^ user.cpp:25:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d",&a,&b,&c); ^