迭代法求平方根

  #include<iostream> #include<math.h> using namespace std; int main(){ double x; cin>>x; double y1,y2; y2=1; while(fabs(y1-y2)>1e-10){ y1=y2; y2=0.5*(y1+x/y1); } cout<<y2; return 0; } y2初值

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