Main.cc: In function 'int main()': Main.cc:8:13: error: expected initializer before '.' token double a.b; ^ Main.cc:9:21: error: 'a' was not declared in this scope scanf("%lf%lf",&a,&b); ^ Main.cc:9:24: error: 'b' was not declared in this scope scanf("%lf%lf",&a,&b); ^