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C++ ios manipulators fixed()用法及代碼示例


C++中的流操縱器的fixed()方法用於為指定的str流設置floatfield格式標誌。該標誌將floatfield設置為fixed。這意味著浮點值將以定點符號表示。

用法:

ios_base& fixed (ios_base& str)

參數:此方法接受str作為參數,這是格式標誌受影響的流。


返回值:此方法返回設置了內部格式標誌的流str。

範例1:

// C++ code to demonstrate 
// the working of fixed() function 
  
#include <iostream> 
  
using namespace std; 
  
int main() 
{ 
  
    // Initializing the float values 
    double x = 1.23; 
  
    cout.precision(5); 
  
    cout << "without fixed flag:"
         << x << endl; 
  
    // Using fixed() 
    cout << "with fixed flag:"
         << fixed << x << endl; 
  
    return 0; 
}
輸出:
without fixed flag:1.23
with fixed flag:1.23000

範例2:

// C++ code to demonstrate 
// the working of fixed() function 
  
#include <iostream> 
  
using namespace std; 
  
int main() 
{ 
  
    // Initializing the float values 
    double x = 1.0; 
  
    cout.precision(5); 
  
    cout << "without fixed flag:"
         << x << endl; 
  
    // Using fixed() 
    cout << "with fixed flag:"
         << fixed << x << endl; 
  
    return 0; 
}
輸出:
without fixed flag:1
with fixed flag:1.00000

範例3:

// C++ code to demonstrate 
// the working of fixed() function 
  
#include <iostream> 
  
using namespace std; 
  
int main() 
{ 
  
    // Initializing the float values 
    double x = 1.23e9; 
  
    cout.precision(5); 
  
    cout << "without fixed flag:"
         << x << endl; 
  
    // Using fixed() 
    cout << "with fixed flag:"
         << fixed << x << endl; 
  
    return 0; 
}
輸出:
without fixed flag:1.23e+09
with fixed flag:1230000000.00000

參考: http://www.cplusplus.com/reference/ios/fixed/



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注:本文由純淨天空篩選整理自guptayashgupta53大神的英文原創作品 ios manipulators fixed() function in C++。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。