Main.cc: In function 'int main()':
Main.cc:9:2: error: expected ';' before 'for'
for(int i=2;i<=n;i++){
^
Main.cc:9:13: warning: statement has no effect [-Wunused-value]
for(int i=2;i<=n;i++){
^
Main.cc:9:14: error: 'i' was not declared in this scope
for(int i=2;i<=n;i++){
^