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// modify showpoint flag
#include <iostream> // std::cout, std::showpoint, std::noshowpoint
int main () {
double a = 30;
double b = 10000.0;
double pi = 3.1416;
std::cout.precision (5);
std::cout << std::showpoint << a << '\t' << b << '\t' << pi << '\n';
std::cout << std::noshowpoint << a << '\t' << b << '\t' << pi << '\n';
return 0;
}
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