Pure Functions :

The functions that return a value when it is invoked.

public int factorial(int a){ //Highlighted Part is first int\nint i;\nf=1;\nfor(i=1;i<=a;i++)\n f=f*i;\nreturn f; //Highlighted Part
\n}

Impure Functions :

The functions that do not return a value when it is invoked.

public void factorial(int a)//Highlighted Part is void{\nint i;\nf=1;\nfor(i=1;i<=a;i++)\n f=f*i;\nSystem.out.println(f);//Highlighted Part\n}

Here you can observe through the highlighted part that both the functions are doing the same task but the upper one is pure as it is returning the value of f whereas the lower one is not returning anything but simply printing the value of f.

Also, there exist two distinct ways of passing values to a function:
\n-Pass By Reference

-Pass By Value

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