钱能C++教材习题j及答案

第四章 //******************* //* 4_1_while.chh * //******************* # include <iostream.h> # include <math.h> void main() { double x,p=1,total=1; int i=1,sign=1; cout<<"please input a double:"<<endl; cin>>x; while (fabs(p)>1e-8 ) { p=sign*p*x/i; total=total+p; sign*=-1; i++; } cout<<"when you input a "<<x<<",you can get:"<<total<<endl; } //********************** //* 4_1_do_while.chh * //********************** # include <iostream.h> # include <math.h> void main() { double x,p=1,total=0; int i=0,sign=-1; cout<<"please input a double:"<<endl; cin>>x; do