ios manipulators scientific() function in C++
Last Updated :
02 Sep, 2019
The scientific() method of stream manipulators in C++ is used to set the floatfield format flag for the specified str stream. This flag sets the floatfield to scientific. It means that, the floating point values will be written in scientific notations.
Syntax:
ios_base& scientific (ios_base& str)
Parameters: This method accepts str as a parameter which is the stream for which the format flag is affected.
Return Value: This method returns the stream str with internal format flag set.
Example 1:
#include <iostream>
using namespace std;
int main()
{
double x = 1.23;
cout.precision(5);
cout << "without scientific flag: "
<< x << endl;
cout << "with scientific flag: "
<< scientific << x << endl;
return 0;
}
|
Output:
without scientific flag: 1.23
with scientific flag: 1.23000e+00
Example 2:
#include <iostream>
using namespace std;
int main()
{
double x = 1.0;
cout.precision(5);
cout << "without scientific flag: "
<< x << endl;
cout << "with scientific flag: "
<< scientific << x << endl;
return 0;
}
|
Output:
without scientific flag: 1
with scientific flag: 1.00000e+00
Example 3:
#include <iostream>
using namespace std;
int main()
{
double x = 1.23e9;
cout.precision(5);
cout << "without scientific flag: "
<< x << endl;
cout << "with scientific flag: "
<< scientific << x << endl;
return 0;
}
|
Output:
without scientific flag: 1.23e+09
with scientific flag: 1.23000e+09
Reference: http://www.cplusplus.com/reference/ios/scientific/
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