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Line 1: int gcd(int m, int n ) 

        {

 Line2:              int r; 

            while ((r = m % n) != 0) { 

          m = n; 

          n = r; 

       } 

           return n; 

          }

Line 1:“New syle” function
declaration lists number and type of arguments. Originally only listed return type. Generated code did not care how many arguments were actually passed,
and everything was a word. Arguments are call-by-value

Line2:Automatic variable Allocated on stack when function entered, released on return Parameters & automatic variables accessed via frame pointer ,Other temporaries also stacked

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