利用do-while语句计算1/1！+1/2！+…+1/20!之和

#include //希望会您有用 using namespace std;// int main() { int i = 1; double sum = 0.0, n; do { n = 1.0; for( int j = 1; j < i + 1; j++ ) n *= j; sum += 1.0 / n; i++; } while( i < 21 ); cout << &qu