void foo(a, b, c)
{
  a = a*2;
  b = b*2;
  X++;
  c = c+b
}



X=1
Y=2
Z=3
foo(X, Y, Z)  

What are the values of X, Y, Z if 
1) formal paramters a, b, c, are all call-by-value?

2) formal paramters a, b, c, are all call-by-reference?

3) formal paramters a, b, c, are all call-by-value/result?

4) formal paramters a, b, c, are all call-by-name

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X=1
foo(X, X, X+1)  

What is the value of X if 
1) formal paramters a, b, and c are all call-by-value?

2) formal paramters a, b, and c are all call-by-reference?

3) formal paramters a, b, and c are all call-by-value/result?

4) formal paramters a, b, and c are all call-by-name

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