Should a single line comment be placed at the end of the line or above the code?

If it is necessary to add a single line comment, do developers usually put a single line comment at the end of the code line, or do they exclusively put a single line above the code? Or the specific situation, specific analysis? Is it your personal habit or your reason. I hope you will discuss it. At the end of the line {code...} above {... if necessary add Single line commentGenerally Single line commentPut the line at the end of the code, or put the line above the code exclusively? Or the specific situation, specific analysis? Is it your personal habit or your reason. I hope you will discuss it.

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Var var1 = 5; // declare and initialize the variable. The value is 5.

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// Declare and initialize the variable. The value is 5var var1 = 5;