Main.cc: In function 'int main()':
Main.cc:6:17: error: 'a' was not declared in this scope
scanf("%d",&a,&b,&c);
^
Main.cc:6:20: error: 'b' was not declared in this scope
scanf("%d",&a,&b,&c);
^
Main.cc:6:23: error: 'c' was not declared in this scope
scanf("%d",&a,&b,&c);
^