Main.cc: In function 'int sum(int)':
Main.cc:12:11: error: a function-definition is not allowed here before '{' token
int main(){
^
Main.cc:4:6: warning: unused variable 'a' [-Wunused-variable]
int a = 1,b = 0;
^
Main.cc:4:12: warning: unused variable 'b' [-Wunused-variable]
int a = 1,b = 0;
^
Main.cc:20:1: error: expected '}' at end of input
}
^
Main.cc:20:1: warning: no return statement in function returning non-void [-Wreturn-type]