From a24eb028a98f101c0d6910df489025d40e0348bd Mon Sep 17 00:00:00 2001
From: Akbar Rahman <hi@alv.cx>
Date: Tue, 23 Jan 2024 16:27:24 +0000
Subject: [PATCH] add code for solutions for exam papers

---
 .../past_papers/20-21/code/1.c                |  36 ++++++++
 .../past_papers/20-21/code/2.c                |  44 ++++++++++
 .../past_papers/20-21/code/3.c                |  59 +++++++++++++
 .../past_papers/20-21/code/Makefile           |   4 +
 .../past_papers/20-21/code/Results.txt        |  15 ++++
 .../past_papers/21-22/code/1                  | Bin 0 -> 15792 bytes
 .../past_papers/21-22/code/1.c                |  80 ++++++++++++++++++
 .../past_papers/21-22/code/2                  | Bin 0 -> 15680 bytes
 .../past_papers/21-22/code/2.c                |  54 ++++++++++++
 .../past_papers/22-23/code/1                  | Bin 0 -> 15584 bytes
 .../past_papers/22-23/code/1.c                |  32 +++++++
 .../past_papers/22-23/code/2                  | Bin 0 -> 15720 bytes
 .../past_papers/22-23/code/2.c                |  50 +++++++++++
 .../past_papers/22-23/code/3                  | Bin 0 -> 15832 bytes
 .../past_papers/22-23/code/3.c                |  48 +++++++++++
 .../past_papers/22-23/code/Makefile           |   4 +
 16 files changed, 426 insertions(+)
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/1.c
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/2.c
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/3.c
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Makefile
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Results.txt
 create mode 100755 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1.c
 create mode 100755 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2.c
 create mode 100755 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1.c
 create mode 100755 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2.c
 create mode 100755 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3.c
 create mode 100644 uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/Makefile

diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/1.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/1.c
new file mode 100644
index 0000000..6d45619
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/1.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define WIDTH 10
+#define INPUT_BUFFER_LEN 64
+/// Used to clear the buffer scanf reads from.
+/// Useful when user enters malformed input, as scanf does not clear
+/// when it fails to read an input.
+#define READ_STDIN_UNTIL_NEWLINE() while (getchar() != '\n'){};
+
+int main() {
+  int rc, height, i, j;
+  char *input[INPUT_BUFFER_LEN];
+  
+  do {
+    printf("Enter height: ");
+    rc = scanf("%d", &height);
+    READ_STDIN_UNTIL_NEWLINE();
+
+    if (rc == 1) {
+      break;
+    }
+
+  } while (1);
+
+  for(i = 0; i < height; i++) {
+    for (j = 0; j < i; j++) {
+      printf(" ");
+    }
+    for (j = 0; j < WIDTH; j++) {
+      printf("#");
+    }
+
+    printf("\n");
+  }
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/2.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/2.c
new file mode 100644
index 0000000..5ef3a61
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/2.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BUF_LEN 1024
+
+#define GRADE_FIRST 70
+#define GRADE_UPPER_SECOND 60
+#define GRADE_LOWER_SECOND 50
+#define GRADE_THIRD 40
+
+int main() {
+  int rc, mark;
+  FILE *fp;
+  char buf[BUF_LEN];
+  char first_name[BUF_LEN];
+  char last_name[BUF_LEN];
+
+  fp = fopen("Results.txt", "r");
+  if (fp == NULL) {
+    printf("Unable to open file Results.txt\n");
+    return 1;
+  }
+
+  while (fgets(buf, BUF_LEN, fp) != NULL) {
+    rc = sscanf(buf, "%s %s\t%d", first_name, last_name, &mark);
+    if (rc != 3) {
+      printf("Failed to read line: %s\n", buf);
+      return 1;
+    }
+    printf("%s %s\t", first_name, last_name);
+    
+    if (mark >= GRADE_FIRST) {
+      printf("First\n");
+    } else if (mark >= GRADE_UPPER_SECOND ) {
+      printf("Upper second\n");
+    } else if (mark >= GRADE_LOWER_SECOND) {
+      printf("Lower second\n");
+    } else if (mark >= GRADE_THIRD) {
+      printf("Third\n");
+    } else {
+      printf("Fail\n");
+    }
+  }
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/3.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/3.c
new file mode 100644
index 0000000..d2c8109
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/3.c
@@ -0,0 +1,59 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+
+#define BUF_LEN 1024
+/// Used to clear the buffer scanf reads from.
+/// Useful when user enters malformed input, as scanf does not clear
+/// when it fails to read an input.
+#define READ_STDIN_UNTIL_NEWLINE() while (getchar() != '\n'){};
+
+
+int cone_volume(float *volume, float radius, float height) {
+  if (radius < 0.0 || height < 0.0) {
+    return -1;
+  }
+  *volume = M_PI*radius*radius*height/3.0;
+  return 0;
+}
+
+int cone_area(float *area, float radius, float height) {
+  if (radius < 0.0 || height < 0.0) {
+    return -1;
+  }
+  *area = M_PI*radius*(radius + sqrt(radius*radius + height*height));
+  return 0;
+}
+
+int main() {
+  int rc;
+  float result, height, radius;
+  char buf[BUF_LEN];
+
+  do {
+    printf("Enter radius of cone: ");
+    rc = scanf("%f", &radius);
+    READ_STDIN_UNTIL_NEWLINE();
+  } while(rc != 1 && radius < 0.0);
+
+  do {
+    printf("Enter height of cone: ");
+    rc = scanf("%f", &height);
+    READ_STDIN_UNTIL_NEWLINE();
+  } while(rc != 1 && height < 0.0);
+
+  rc = cone_area(&result, radius, height);
+  if(rc != 0) {
+    printf("Unable to calculate surface area\n");
+  } else {
+    printf("Surface area: %.3f\n", result);
+  }
+
+  rc = cone_volume(&result, radius, height);
+  if(rc != 0) {
+    printf("Unable to calculate volume\n");
+  } else {
+    printf("Volume: %.3f\n", result);
+  }
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Makefile b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Makefile
new file mode 100644
index 0000000..01e2cdf
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Makefile
@@ -0,0 +1,4 @@
+CFLAGS=-lm
+
+%.c:
+	$(CC) $(CFLAGS) -c $< -o $*
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Results.txt b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Results.txt
new file mode 100644
index 0000000..4f6c2cf
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/20-21/code/Results.txt
@@ -0,0 +1,15 @@
+Fred Bloggs		73
+Michael Smith	43
+Claire White	64
+Simon Black		23
+Joshua Mason	-20
+Jenny Jones		57
+George Clark	40
+Ann Bell		101
+Fay Allen		52
+John Morris		60
+Steven Hayes	47
+Hannah Jackson	94
+Alex Benson		50
+Susan Baker		70
+Wendy Brooks	57
\ No newline at end of file
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1 b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1
new file mode 100755
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diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1.c
new file mode 100644
index 0000000..29fd34d
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/1.c
@@ -0,0 +1,80 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BUF_SIZE (size_t) 4096
+
+typedef struct {
+  int time_seconds;
+  float temperature;
+} Datum;
+
+int main() {
+  int rc, i, data_size;
+  char buf[BUF_SIZE+1];
+  char *rc_cp;
+  FILE *fp;
+  Datum *data;
+
+  printf("Enter filename of temperature data: ");
+  rc = scanf("%s", buf);
+  // scanf return number of successfully scanned items
+  if (rc != 1) {
+    printf("Unable to read input\n");
+    return -1;
+  }
+
+  fp = fopen(buf, "r");
+  if (fp == NULL) {
+    printf("Unable to open file '%s' for reading\n", buf);
+    return -1;
+  }
+
+  rc_cp = fgets(buf, BUF_SIZE, fp);
+  if (rc_cp == NULL) {
+    printf("Unable to read first line of file\n");
+    return -1;
+  }
+
+  rc = sscanf(buf, "%d", &data_size);
+  if (rc != 1) {
+    printf("Unable to parse first line of file as integer\n");
+    return -1;
+  }
+
+  data = (Datum*) malloc(data_size * sizeof(Datum));
+
+  for(i = 0; i < data_size; i++) {
+    rc_cp = fgets(buf, BUF_SIZE, fp);
+    if (rc_cp == NULL) {
+      printf("Unexpected EOF or file read error\n");
+      return -1;
+    }
+    
+    rc = sscanf(buf, "%d", &data[i].time_seconds);
+    if (rc != 1) {
+      printf("Unable to parse line as time (integer): %s\n", buf);
+      return -1;
+    }
+
+    rc_cp = fgets(buf, BUF_SIZE, fp);
+    if (rc_cp == NULL) {
+      printf("Unexpected EOF or file read error\n");
+      return -1;
+    }
+    
+    rc = sscanf(buf, "%f", &data[i].temperature);
+    if (rc != 1) {
+      printf("Unable to parse line as temperature (float): %s\n", buf);
+      return -1;
+    }
+  }
+
+  printf("Time/s\tTemperature\n");
+  for(i = 0; i < data_size; i++) {
+    printf("%d\t%.2f\n", data[i].time_seconds, data[i].temperature);
+  }
+
+  fclose(fp);
+  free(data);
+  return 0;
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2 b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2
new file mode 100755
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diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2.c
new file mode 100644
index 0000000..70abe61
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/21-22/code/2.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define CLR_STDIN() while(getchar() != '\n'){}
+
+/// Calculate kinetic energy of object
+///
+/// *e - pointer to store calculated energy in
+/// m  - mass of object, must be greater than 0
+/// v  - velocity of object
+///
+/// Returns 1 on success, 0 on failure
+int calculate_kinetic_energy(float *e, float m, float v) {
+  // cannot have negative mass
+  if (m <= 0.0) return 0;
+
+  *e = 0.5 * m * v * v;
+
+  return 1;
+}
+
+int main() {
+  int rc;
+  float e, m = 0.0, v = 0.0;
+
+  do {
+    printf("Enter mass of object: ");
+    rc = scanf("%f", &m);
+    CLR_STDIN();
+    if (rc != 1) {
+      continue;
+    }
+  } while (m <= 0.0);
+
+  do {
+    printf("Enter velocity of object: ");
+    rc = scanf("%f", &v);
+    CLR_STDIN();
+    if (rc != 1) {
+      continue;
+    }
+    break;
+  } while (1);
+
+  rc = calculate_kinetic_energy(&e, m, v);
+  if (rc != 1) {
+    printf("calculate_kinetic_energy failed\n");
+    return -1;
+  }
+
+  printf("Kinetic energy: %.3f kJ\n", e/1000);
+
+  return 0;
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1 b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1
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diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1.c
new file mode 100644
index 0000000..8df65d5
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/1.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define CLR_STDIN() while(getchar() != '\n'){}
+
+int main() {
+  int rc, i = 0;
+  float input, guess, prev;
+  
+  do {
+    printf("Number to square root: ");
+    rc = scanf("%f", &input);
+    CLR_STDIN();
+    if (rc != 1) {
+      continue;
+    }
+  } while (input <= 0.0);
+
+  guess = input/3;
+
+  do {
+    i++;
+    prev = guess;
+    guess = 0.5 * (prev + (input/prev));
+    printf("Input: %.5f Result: %.5f Iterations: %d Error: %f\n", input, guess, i,  labs(prev-guess)/input);
+  } while ( fabs((prev-guess)/input) > 0.000001 );
+
+  printf("Input: %.5f Result: %.5f Iterations: %d\n", input, guess, i);
+
+  return 0;
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2 b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2
new file mode 100755
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HcmV?d00001

diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2.c
new file mode 100644
index 0000000..7ab1f44
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/2.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define CLR_STDIN() while(getchar() != '\n'){}
+
+int polygon_area(float *p_area, unsigned int sides, float length) {
+  if (sides < 3) return 0;
+
+  *p_area = length*length*(float)sides / (4*tan(M_PI/sides));
+
+  return 1;
+}
+
+int main() {
+  int rc;
+  unsigned int sides = 0;
+  float length, area;
+
+  polygon_area(&area, sides, length);
+
+  do {
+    printf("Enter number of sides: ");
+    rc = scanf("%u", &sides);
+    CLR_STDIN();
+
+    if (rc == 1) {
+      break;
+    }
+  } while (1);
+
+  do {
+    printf("Enter side length: ");
+    rc = scanf("%f", &length);
+    CLR_STDIN();
+
+    if (rc == 1) {
+      break;
+    }
+  } while (1);
+
+  rc = polygon_area(&area, sides, length);
+  if (rc == 0) {
+    printf("Error\n");
+    return 1;
+  }
+
+  printf("Area: %.2f\n", area);
+  return 0;
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3 b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3
new file mode 100755
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HcmV?d00001

diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3.c b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3.c
new file mode 100644
index 0000000..4215ac7
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/3.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define BUF_LEN 4096
+#define CLR_STDIN() while(getchar() != '\n'){}
+
+int main() {
+  char buf[BUF_LEN+1];
+  char letter;
+  unsigned int mode;
+  FILE *fp;
+  int rc;
+
+  do {
+    printf("Enter file name: ");
+    rc = scanf("%s", buf);
+    if (rc == 1) break;
+  } while(1);
+
+  fp = fopen(buf, "r");
+  if (fp == NULL) {
+    printf("Unable to open file '%s'\n", buf);
+    return -1;
+  }
+
+  printf("---Formats---\n");
+  printf("1) Character only\n");
+  printf("2) ASCII only\n");
+  printf("3) Character and ASCII\n");
+
+  do {
+    printf("Select format: ");
+    rc = scanf("%d", &mode);
+    CLR_STDIN();
+    if (rc == 1 && mode < 4 && mode > 0) break;
+  } while(1);
+
+  while ((letter = fgetc(fp)) != EOF) {
+    if (mode == 1 || mode == 3) printf("Character: %c", letter);
+    if (mode == 3) printf(" ");
+    if (mode == 2 || mode == 3) printf("ASCII: %u", letter);
+    printf("\n");
+  }
+
+  fclose(fp);
+  return 0;
+}
diff --git a/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/Makefile b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/Makefile
new file mode 100644
index 0000000..01e2cdf
--- /dev/null
+++ b/uni/mmme/3085_computer_engineering_and_mechatronics/past_papers/22-23/code/Makefile
@@ -0,0 +1,4 @@
+CFLAGS=-lm
+
+%.c:
+	$(CC) $(CFLAGS) -c $< -o $*