Week 03 Laboratory Exercises

Write a MIPS assembler program bad_pun.s, which is equivalent to this C program:

// A simple C program that attempts to be punny

#include <stdio.h>

int main(void)
{
  printf("Well, this was a MIPStake!\n");

  return 0;
}

For example:

1092 mipsy bad_pun.s
Well, this was a MIPStake!

When you think your program is working, you can use autotest to run some simple automated tests:

1092 autotest bad_pun 

When you are finished working on this exercise, you must submit your work by running give:

give dp1092 lab03_bad_pun bad_pun.s

You must run give before Monday 01 January 00:00 (midnight) (Saturday 01 January 00:00) to obtain the marks for this lab exercise. Note that this is an individual exercise, the work you submit with give must be entirely your own.

Write a MIPS assembler program gaussian_sum.s, which is equivalent to this C program:

// A simple C program that calculates the Gaussian sum between two numbers
// Written 12/2/2022
// by Dylan Brotherston (d.brotherston@unsw.edu.au)

#include <stdio.h>

int main(void)
{
  int number1, number2;

  printf("Enter first number: ");
  scanf("%d", &number1);

  printf("Enter second number: ");
  scanf("%d", &number2);

  int gaussian_sum = ((number2 - number1 + 1) * (number1 + number2)) / 2;

  printf("The sum of all numbers between %d and %d (inclusive) is: %d\n", number1, number2, gaussian_sum);

  return 0;
}

For example:

1092 mipsy gaussian_sum.s
Enter first number: 1
Enter second number: 100
The sum of all numbers between 1 and 100 (inclusive) is: 5050
1092 mipsy gaussian_sum.s
Enter first number: 1
Enter second number: 1000
The sum of all numbers between 1 and 1000 (inclusive) is: 500500
1092 mipsy gaussian_sum.s
Enter first number: 10
Enter second number: 13
The sum of all numbers between 10 and 13 (inclusive) is: 46

When you think your program is working, you can use autotest to run some simple automated tests:

1092 autotest gaussian_sum 

When you are finished working on this exercise, you must submit your work by running give:

give dp1092 lab03_gaussian_sum gaussian_sum.s

You must run give before Monday 01 January 00:00 (midnight) (Saturday 01 January 00:00) to obtain the marks for this lab exercise. Note that this is an individual exercise, the work you submit with give must be entirely your own.

In the files for this lab, you have been given grade.s, a MIPS assembler program which reads a number and always prints FL:

1092 mipsy grade.s
Enter a mark: 100
FL

Add code to grade.s to make it equivalent to this C program:

// read a mark and print the corresponding UNSW grade

#include <stdio.h>

int main(void) {
    int mark;

    printf("Enter a mark: ");
    scanf("%d", &mark);

    if (mark < 50) {
        printf("FL\n");
    } else if (mark < 65) {
        printf("PS\n");
    } else if (mark < 75) {
        printf("CR\n");
    } else if (mark < 85) {
        printf("DN\n");
    } else {
        printf("HD\n");
    }

    return 0;
}

For example:

1092 mipsy grade.s
Enter a mark: 42
FL
1092 mipsy grade.s
Enter a mark: 72
CR
1092 mipsy grade.s
Enter a mark: 89
HD

When you think your program is working, you can use autotest to run some simple automated tests:

1092 autotest grade 

When you are finished working on this exercise, you must submit your work by running give:

give dp1092 lab03_grade grade.s

You must run give before Monday 01 January 00:00 (midnight) (Saturday 01 January 00:00) to obtain the marks for this lab exercise. Note that this is an individual exercise, the work you submit with give must be entirely your own.

In the files for this lab, you have been given a MIPS assembler program count.s, which reads a number and prints 42:

1092 mipsy count.s
Enter a number: 13
42

Add code to count.s to make it equivalent to this C program:

// read a number n and print the integers 1..n one per line

#include <stdio.h>

int main(void) {
    int number, i;

    printf("Enter a number: ");
    scanf("%d", &number);

    i = 1;
    while (i <= number) {
        printf("%d\n", i);
        i = i + 1;
    }

    return 0;
}

For example:

1092 mipsy count.s
Enter a number: 4
1
2
3
4
1092 mipsy count.s
Enter a number: 10
1
2
3
4
5
6
7
8
9
10

When you think your program is working, you can use autotest to run some simple automated tests:

1092 autotest count 

When you are finished working on this exercise, you must submit your work by running give:

give dp1092 lab03_count count.s

You must run give before Monday 01 January 00:00 (midnight) (Saturday 01 January 00:00) to obtain the marks for this lab exercise. Note that this is an individual exercise, the work you submit with give must be entirely your own.

In the files for this lab, you have been given seven_eleven.s, a MIPS assembler program which reads a number and prints 42:

1092 mipsy seven_eleven.s
Enter a number: 13
42

Add code to seven_eleven.s to make it equivalent to this C program:

// Read a number and print positive multiples of 7 or 11 < n

#include <stdio.h>

int main(void) {
    int number, i;

    printf("Enter a number: ");
    scanf("%d", &number);

    i = 1;
    while (i < number) {
        if (i % 7 == 0 || i % 11 == 0) {
            printf("%d\n", i);
        }
        i = i + 1;
    }

    return 0;
}

For example:

1092 mipsy seven_eleven.s
Enter a number: 15
7
11
14
1092 mipsy seven_eleven.s
Enter a number: 42
7
11
14
21
22
28
33
35

When you think your program is working, you can use autotest to run some simple automated tests:

1092 autotest seven_eleven 

When you are finished working on this exercise, you must submit your work by running give:

give dp1092 lab03_seven_eleven seven_eleven.s

You must run give before Monday 01 January 00:00 (midnight) (Saturday 01 January 00:00) to obtain the marks for this lab exercise. Note that this is an individual exercise, the work you submit with give must be entirely your own.

In the files for this lab, you have been given a MIPS assembler program sequence.s, which reads a number and prints 42:

1092 mipsy sequence.s
Enter the starting number: 13
42

Add code to sequence.s to make it equivalent to this C program:

// Read three numbers `start`, `stop`, `step`
// Print the integers bwtween `start` and `stop` moving in increments of size `step`

#include <stdio.h>

int main(void) {
    int start, stop, step;

    printf("Enter the starting number: ");
    scanf("%d", &start);

    printf("Enter the stopping number: ");
    scanf("%d", &stop);

    printf("Enter the step size: ");
    scanf("%d", &step);

    if (stop < start) {
        if (step < 0) {
            for (int i = start; i >= stop; i += step) {
                printf("%d\n", i);
            }
        }
    }

    if (stop > start) {
        if (step > 0) {
            for (int i = start; i <= stop; i += step) {
                printf("%d\n", i);
            }
        }
    }

    return 0;
}

For example:

1092 mipsy sequence.s
Enter the starting number: 1
Enter the stopping number: 10
Enter the step size: 2
1
3
5
7
9
1092 mipsy sequence.s
Enter the starting number: 1
Enter the stopping number: -10
Enter the step size: -2
1
-1
-3
-5
-7
-9

When you think your program is working, you can use autotest to run some simple automated tests:

1092 autotest sequence 

When you are finished working on this exercise, you must submit your work by running give:

give dp1092 lab03_sequence sequence.s

You must run give before Monday 01 January 00:00 (midnight) (Saturday 01 January 00:00) to obtain the marks for this lab exercise. Note that this is an individual exercise, the work you submit with give must be entirely your own.