Compilare: main.cpp: In function 'int main()': main.cpp:90:13: warning: unused variable 'a' [-Wunused-variable] int i , a , b , c; ^ main.cpp:90:17: warning: unused variable 'b' [-Wunused-variable] int i , a , b , c; ^ main.cpp:90:21: warning: unused variable 'c' [-Wunused-variable] int i , a , b , c; ^ main.cpp:92:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:96:54: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&v[i].a,&v[i].b,&v[i].c); ^