(a) Develop stack machine code equivalents of the following simple programs:
(1) void main () { // print numbers 0 through 10
for (int i = 0; i <= 10; i++) write(i, "\n")
}
(2) void main() { // factorials
int n, f;
read(n);
write(n, "! =");
f = 1;
while (n > 0) {
f = f * n;
n = n - 1;
}
write(f);
}
(3) void main () { // simple array handling
int i = 1;
int[] list = new int[11];
list[0] = 5;
while (i <= 10) {
list[i] = 2 - list[i-1];
i++;
}
}
(b) Consider the following general form of T diagram. Although it uses the letters A through I in the various arms of the Ts, one could draw the diagram with fewer letters. How and why?
.--------------------------. .--------------------------.
| | | |
| A ----------> B | | C -----------> D |
| | | |
`-------. .--------------------------. .-------'
| | | |
| E | F --------> G | H |
| | | |
`------------------. .------------------'
| |
| I |
| |
`----------'
(c) In the practical sessions you should have used the Extacy Modula-2 to C translator. This was developed in Russia by a team who used the JPI Modula-2 compiler available for the PC. But the demonstration system we downloaded from the Internet came with the file XC.EXE, and a few other modules written in Modula- 2 (but not the source of the XC.EXE executable itself). Draw T-diagrams showing the process the Russians must have used to produce this system, and go on to draw T-diagrams showing how you managed to take the program SIEVE.MOD and run it on the PC using the Borland C++ system as your compiler of choice.