Compilare: user.cpp: In function ‘int main()’: user.cpp:14:19: warning: unused variable ‘l’ [-Wunused-variable] int n,i,x,s=0,l=0,s1=0; ^ user.cpp:14:23: warning: unused variable ‘s1’ [-Wunused-variable] int n,i,x,s=0,l=0,s1=0; ^ user.cpp:16:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:19:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%c%c%c",&x,&c1,&c2,&c3); ^ user.cpp:33:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^