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14 lines
155 B
C++
14 lines
155 B
C++
#include <iostream>
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#include <iomanip>
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using namespace std;
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int main(){
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double a;
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double b;
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cin >>a;
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b=a*a/2.0/2.0;
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printf("%.2f",b);
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return 0;
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}
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