立绝诞过 ostream using name space std int Average (int i) //声明静态局部变量目右仝素命局部可 static int sum=0. count =0. sum sum +i: count++ return sum/count int maino int num;//局部变量,具有动态生存期 do I cout< Enter numbers (-1 to quit): cin>>num if(num!=-1) cout < average is: < Average(num)<endl f while(num>-1) x return 0 17C++语言程序设计 17 #include <iostream> using namespace std; int Average(int i) { //声明静态局部变量，具有全局寿命，局部可见 static int sum = 0, count = 0; sum = sum + i; count++; return sum / count; } int main() { int num; //局部变量，具有动态生存期 do { cout << "Enter numbers (-1 to quit): "; cin >> num; if(num != -1) cout << " average is: " << Average(num) <<endl; } while(num > -1); return 0; }