static_cast

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

thank you

Code:

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

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Quote:

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Why using it and where?

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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:

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

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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:

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

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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.