Compilare: user.cpp: In function ‘int main()’: user.cpp:59:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr,op,sum,i; ^ user.cpp:59:12: warning: unused variable ‘op’ [-Wunused-variable] int nr,op,sum,i; ^ user.cpp:59:15: warning: unused variable ‘sum’ [-Wunused-variable] int nr,op,sum,i; ^ user.cpp:60:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&m,&k); ^ user.cpp:63:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&li[i],&co[i]); ^