Hello guys I am new in C++ I am trying to write the function to calculate the second moment of inertia and set the precision with 3 decimal places. In the output does not apply the 3 decimal places in the first call but the following 4 calls does applied. Here is my codes , please help me find the error and if possible please explain some details thank you very much !
double beamMoment(double b, double h) //the function that calculating the second moment of inertia
{
double I; //variables b=base, h=height, I= second moment of inertia
I = b * (pow(h, 3.0) / 12); // formular of the second momeent of inertia
ofs << "b=" << b << "," << "h=" << h << "," << "I=" << I << setprecision(3) << fixed << endl;
ofs << endl;
return I;
}
int main()
{
beamMoment(10,100);
beamMoment(33, 66);
beamMoment(44, 88);
beamMoment(26, 51);
beamMoment(7, 19);
system("pause");
return 0;
}
The output in my text file is as follow :
b=10,h=100,I=833333
b=33.000,h=66.000,I=790614.000
b=44.000,h=88.000,I=2498730.667
b=26.000,h=51.000,I=287410.500
b=7.000,h=19.000,I=4001.083
You have to set stream precision before printing a number.
ofs << 5.5555 << setprecision(3) << endl; // prints "5.5555"
ofs << setprecision(3) << 5.5555 << endl; // prints "5.555"
Stream operators <<
and >>
are, in fact, methods that can be chained. Let's say we have a piece of example java code like:
dog.walk().stopByTheTree().pee();
In C++, if we'd use stream operators, it'd look like:
dog << walk << stopByTheTree << pee;
Operations on dog
objects are executed from left to right, and the direction of "arrows" doesn't matter. These method names are just syntactic sugar.
Look here for more details.
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