Motorola Axiom CMD11E1 Podręcznik Użytkownika Pobierz pdf (Strona 54)

54 CHAPTER 4. PROGRAMS

char v;

char total;

main() {

v = 0;

total = 0;

v = v+1;

total = total + v;

v = v+1;

total = total + v;

v = v+1;

total = total + v;

v = v+1;

total = total + v;

v = v+1;

total = total + v;

printf("%02X", (unsigned) total);

return 0;

}

2. Modify the program so that the initialization v = 0 is replaced by a call to

getchar(). Run your C program and try diﬀerent inputs at the keyboard.

Make corresponding changes to the assembly language program and verify

your results.

3. Modify the assembly language program so that you use a counting loop to

loop 5 times over the basic code.

4. Modify the previous version (using a loop) where the number of times around

the loop is in an 8-bit variable called count. Your program should initialize

the variable to 5 so that the loop is executed 5 times.

5. A convenient way to get a value between 0 and 9 from the user is to use the

instruction sequence

jsr inchar

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 100 101

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