# Program to demonstrate you can't pass changes to parameters
# back to the caller through the the argument list
# Matt Bishop, Apr. 27, 2009
# for ECS 10 Spring 2009

# this routine tries changes outp
# parameters: inp, an integer
#             outp, an integer
def testparam(inp, outp):
    # announce the values on entry to the function
    print "test begins: inp =", inp, "and outp =", outp;
    # change the value of outp
    outp = inp + 10;
    # announce the values to see if the change worked
    print "test ends: inp =", inp, "and outp =", outp;

# call a function that changes parameter values
# and see if the change is reflected in the caller
# calls: testparam
def main():
    # set the values to be used
    a = 1;
    b = 2;
    # announce the values in the caller, before the call
    print "program begins: a =", a, "and b =", b;
    # now make the call
    testparam(a, b);
    # announce the values in the caller, after the call
    print "program ends: a =", a, "and b =", b;

main();