added weekly exercises of isp-ws25

c/isp-ws25/weeklies/week03/w03ex01.c

@@ -0,0 +1,52 @@
+/*
+- find mistakes in the given source code
+- lines with incorrect code are commented, with the correct input below
+
+[] take seconds as user input
+[] return seconds, minutes, hours as struct
+*/
+
+#include <stdio.h>
+
+// struct _Time_
+typedef struct _Time_
+{
+  int seconds_;
+  int minutes_;
+  int hours_;
+  //};
+} Time;
+
+Time convertTime(int total_seconds);
+
+int main(void)
+{
+  int total_seconds = 0;
+  //Time time;
+  Time time = {0, 0, 0};
+
+  printf("Total number of seconds: ");
+  //scanf("%c", &total_seconds);
+  scanf("%d", &total_seconds);
+
+  //time = convertTime(total_seconds)
+  time = convertTime(total_seconds);
+
+  printf("%-8s %8d\n%-8s %8d\n%-8s %8d\n", "Hours:", time.hours_, "Minutes:", time.minutes_, "Seconds:", time.seconds_);
+
+  return 0;
+}
+
+//float convertTime(total_seconds)
+Time convertTime(int total_seconds)
+{
+  Time result;
+
+  result.hours_ = total_seconds / 3600;
+  total_seconds = total_seconds % 3600;
+  result.minutes_ = total_seconds / 60;
+  //result.seconds_ = total_seconds * 60;
+  result.seconds_ = total_seconds % 60;
+
+  return result;
+}

c/isp-ws25/weeklies/week03/w03ex02.c

@@ -0,0 +1,84 @@
+/*
+[] implement logTemperature()
+  [x] take current loop iteration as argument
+  [x] print "Enter temperature log #X:"
+  [x] take temperature as int
+  [x] if higher / lower than constants, print "Temperature X is impossible\n"
+  [x] if higher / lower than constants, ask user again
+  [x] if valid, print "Logged temperature: X degree Celsius\n"
+[x] implement calculateAbsoluteDifference()
+  [x] take two int as argument
+  [x] return absolute difference
+
+Example:
+Welcome to the temperature logger!
+Enter temperature log #1:-300
+Temperature -300 is impossible
+Enter temperature log #1:30
+Logged temperature: 30 degree Celsius
+Enter temperature log #2:20
+Logged temperature: 20 degree Celsius
+Enter temperature log #3:50000
+Temperature 50000 is impossible
+Enter temperature log #3:25
+Logged temperature: 25 degree Celsius
+The difference of min/max values is 10
+*/
+
+#include <stdio.h>
+
+#define LOWEST_POSSIBLE_TEMPERATURE (-273) // absolute zero
+#define HIGHEST_POSSIBLE_TEMPERATURE (6000) // approx. temperature of sun's photosphere (of course, temperatures can get higher)
+#define MAX_ITERATION 3
+
+int logTemperature(int current_iteration);
+int calculateAbsoluteDifference(int minimum, int maximum);
+
+int main(void)
+{
+  printf("Welcome to the temperature logger!\n");
+  int cur_min = HIGHEST_POSSIBLE_TEMPERATURE; // initialize with highest value to find lower values
+  int cur_max = LOWEST_POSSIBLE_TEMPERATURE; // initialize with lowest value to find high values
+
+  for (int log_index = 0; log_index < MAX_ITERATION; ++log_index)
+  {
+    int temp = logTemperature(log_index + 1); // +1 to start with 1 instead of 0
+    if(temp < cur_min)
+    {
+      cur_min = temp;
+    }
+    if(temp > cur_max)
+    {
+      cur_max = temp;
+    }
+  }
+
+  int diff = calculateAbsoluteDifference(cur_min, cur_max);
+  printf("The difference of min/max values is %d\n", diff);
+  return 0;
+}
+
+int calculateAbsoluteDifference(int minimum, int maximum)
+{
+  return maximum - minimum;
+}
+
+int logTemperature(int current_iteration)
+{
+  int temperature = 0;
+
+  printf("Enter temperature log #%d:", current_iteration);
+  scanf("%d", &temperature);
+  
+  if(temperature > HIGHEST_POSSIBLE_TEMPERATURE || temperature < LOWEST_POSSIBLE_TEMPERATURE)
+  {
+    printf("Temperature %d is impossible\n", temperature);
+    temperature = logTemperature(current_iteration);
+  }
+  else
+  {
+    printf("Logged temperature: %d degree Celsius\n", temperature);
+  }
+  
+  return temperature;
+}

c/isp-ws25/weeklies/week03/w03ex03.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+
+int lucas(int number);
+
+int main(void)
+{
+  int index_position = 0;
+  int lucas_number = 0;
+  
+  printf("Enter index position: ");
+  scanf("%d", &index_position);
+  
+  if(index_position < 0)
+  {
+    printf("Entered position must be a non-negative integer\n");
+    return 1;
+  }
+
+  lucas_number = lucas(index_position);
+
+  printf("lucas(%d) = %d\n", index_position, lucas_number);
+  
+  return 0;
+}
+
+int lucas(int number)
+{
+  int result = 0;
+  
+  if(number == 0){return 2;}
+  if(number == 1){return 1;}
+
+  result = lucas(number - 1) + lucas(number - 2);
+  
+  return result;
+}