[已解决]cout 的 fixed 等怎么消除对后面输出的影响

柿子饼同学

#include <bits/stdc++.h>
using namespace std;
int main(){
        ios::sync_with_stdio(false);
        double a = 3.1415;
        double b = 3333.1415;
        cout << fixed << setprecision(4) << a << endl;
        cout << setprecision(4) << b << endl;
        return 0;
}

如题 , 只写了一个 fixed , 但是影响了后面的输出 , 应该怎么解决呢

最佳答案

月排行榜 / 总排行榜

人造人

2022-4-26 15:33:34

http://www.cplusplus.com/reference/ios/fixed/?kw=fixed

The default notation (none) is a different floatfield value than either fixed or scientific. The default notation can be selected by calling str.unsetf(ios_base::floatfield).

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人造人

http://www.cplusplus.com/reference/ios/fixed/?kw=fixed

The default notation (none) is a different floatfield value than either fixed or scientific. The default notation can be selected by calling str.unsetf(ios_base::floatfield).

傻眼貓咪

std::defaultfloat

傻眼貓咪

#include <iostream>     // std::cout, std::fixed, std::scientific

int main () {
  double a = 3.1415926534;
  double b = 2006.0;
  double c = 1.0e-10;

  std::cout.precision(5);

  std::cout << "原样:\n";
  std::cout << a << '\n' << b << '\n' << c << '\n';

  std::cout << '\n';

  std::cout << "fixed:\n" << std::fixed;
  std::cout << a << '\n' << b << '\n' << c << '\n';

  std::cout << '\n';

  std::cout << "原样:\n" << std::defaultfloat;
  std::cout << a << '\n' << b << '\n' << c << '\n';
  return 0;
}

原样:
3.1416
2006
1e-10

fixed:
3.14159
2006.00000
0.00000

原样:
3.1416
2006
1e-10

柿子饼同学

傻眼貓咪 发表于 2022-4-26 15:38

感谢~