double n=0;
double a = 2.555;
cout <<"n是"<< setprecision(2) << n<<endl;
printf("n是%.1f\n", n);
cout <<"a是"<< setprecision(2) << a << endl;
printf("a是%.1f\n", a);
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double n=0;
double a = 2.555;
cout <<"n是"<< setprecision(2) << n<<endl;
printf("n是%.1f\n", n);
cout <<"a是"<< setprecision(2) << a << endl;
printf("a是%.1f\n", a);
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