Homework One: Solutions



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Assignment5

Homework Five

CS323 Programming Languages




Chapter Nine Problems:

  1. Consider the following program written in C++ syntax:

int main(void)


{
int value = 2, list[5] = {1, 3, 5, 7, 9};
swap(value, list[0]);
swap(list[0], list[1]);
swap(value, list[value]);
}

void swap (int a, int b)


{
int temp;
temp = a;
a = b;
b = temp;
}

For each of the following parameter passing methods, what are all of the values of the variables value and list after each of the three calls to swap?





    1. Passed by value




    1. Passed by reference




    1. Passed by value result




    1. Passed by name



Chapter Ten Problems:



  1. Show the stack with all activation record instances, including static and dynamic chains, when execution reaches position 1 in the following skeletal program. Assume Bigsub is at level 0.




  1. Show the chain offset and local offset for each variable in the expression at position 1 assuming static scope.




  1. Show the variable stack configuration at position 1 assuming dynamic scope and a shallow access implementation.



p
Calling sequence for this pgoram for execution to reach D is:

Bigsub calls A


A calls B
B calls A
A calls C
C calls D
rocedure
Bigsub is

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