C++中的流操纵器的fixed()方法用于为指定的str流设置floatfield格式标志。该标志将floatfield设置为fixed。这意味着浮点值将以定点符号表示。
用法:
ios_base& fixed (ios_base& str)
参数:此方法接受str作为参数,这是格式标志受影响的流。
返回值:此方法返回设置了内部格式标志的流str。
范例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;
}
输出:
without fixed flag:1.23 with fixed flag:1.23000
范例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;
}
输出:
without fixed flag:1 with fixed flag:1.00000
范例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;
}
输出:
without fixed flag:1.23e+09 with fixed flag:1230000000.00000
参考: http://www.cplusplus.com/reference/ios/fixed/
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