static_cast

Hi everyone
can anyone clariy to me the use of static_cast with example.
Why using it and where?

thank you

Code:

float fVal = 12.6f;
int iVal = static_cast<int>(fVal);

Why using it and where?

To announce to the reader of your code that a value is being converted to a different type. Sometimes, the compiler will implicity convert types for you:

Code:

double d = 10.7;
int n = d;
cout<<n<<endl;  //10

But anyone who isn't aware that an automatic conversion is taking place might get confused. So, it is said to be good practice to make everything explicit by writing:

Code:

double d = 10.7;
int n = static_cast<int>(d);
cout<<n<<endl;  //10

That ugly syntax punches the reader in the face to let them know n isn't going to equal 10.7.

Thank you so much, I fully understand it now.