Main.cc: In function ‘int main()’: Main.cc:9:5: error: expected ‘,’ or ‘;’ before ‘for’ for (int i=1; i<=n; i++) { ^~~ Main.cc:9:19: error: ‘i’ was not declared in this scope for (int i=1; i<=n; i++) { ^ Main.cc:7:9: warning: unused variable ‘k’ [-Wunused-variable] int k=1; ^ Main.cc:8:9: warning: unused variable ‘product’ [-Wunused-variable] int product=1 ^~~~~~~