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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