40 lines
591 B
C++
40 lines
591 B
C++
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#include <iostream>
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using namespace std;
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float square_root(int a,int p){
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int s=0;
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int e=a;
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float ans=-1;
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int mid;
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while(s<=e){
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mid=(s+e)/2;
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if (mid*mid==a)
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return mid;
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else if(mid*mid<a){
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s=mid+1;
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ans=mid;
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}
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else
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e=mid-1;
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}
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float inc=0.1;
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for(int times=1;times<=p;times++){
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while(ans*ans<=a){
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ans=ans+inc;
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}
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ans=ans-inc;
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inc=inc/10;
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}
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return ans;
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}
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int main() {
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int n;
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cin>>n;
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cout<<square_root(n,3);
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}
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