lab 9 works

HW2_182416MVEB_Tran_Vu/data.txt

@@ -6,4 +6,4 @@
 5 5 5 1 4
 4 5 3 5 4
 4 4 3 4 5
-5 5 5 5 5
\ No newline at end of file
+5 5 5 5 99
\ No newline at end of file

HW2_182416MVEB_Tran_Vu/main.c

@@ -2,7 +2,7 @@
  * File:   homework2.c
  * Author: Tran Minh Huy Vu
  *
- * Created on October 4, 2018, 1:50 PM
+ * Created on October 29, 2018, 3:50 PM
  * Description: Creating a 2D array as a score database for students and their grades
  *              and calculate the average and find the best student.
  */

Lab 9/bonus_task.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+int toBase10(char*, int);
+char* toOtherBase(int, int);
+int charToInt(char);
+char intToChar(int);
+
+int main() {
+  int size = 1;
+  int location = 0;
+
+  char* input = malloc(size * sizeof(char));
+  int baseInput;
+  int baseOutput;
+
+  printf("Please input a number: ");
+  char c;
+  while ((c = getchar()) != 10) {
+    input[location++] = c;
+    if (location >= size) {
+      size++;
+      input = realloc(input, sizeof(char));
+    }
+  }
+  input[location] = '\0';
+  printf("Base of input: ");
+  scanf("%d", &baseInput);
+
+  printf("Desired output base: ");
+  scanf("%d", &baseOutput);
+
+  int resultBase10 = toBase10(input, baseInput);
+  if (baseOutput == 10) {
+    printf("Output: %d\n", resultBase10);
+  } else {
+    char* result = toOtherBase(resultBase10, baseOutput);
+    printf("Output: ");
+    for (int i = strlen(result); i >= 0; i--) {
+      printf("%c", result[i]);
+    }
+    printf("\n");
+    free(result);
+  }
+
+  free(input);
+  return 0;
+}
+
+int toBase10(char* input, int base) {
+  int count = strlen(input);
+  int result = 0;
+  int location = 0;
+  for (int i = count - 1; i >= 0; i--) {
+    result += charToInt(input[i]) * (int)pow(base, location++);
+  }
+  return result;
+}
+
+int charToInt(char input) {
+  if (input > '9') return input - 'a' + 10;
+  else return input - '0';
+}
+
+char* toOtherBase(int input, int base) {
+  int size = 1;
+  int location = 0;
+
+  char* result = malloc(size * sizeof(char));
+  int n = input;
+  int r;
+  while (n > 0) {
+    r = n % base;
+    n /= base;
+
+    result[location++] = intToChar(r);
+    if (location >= size) {
+      size++;
+      result = realloc(result, size * sizeof(char));
+    }
+  }
+  result[location] = '\0';
+  return result;
+}
+
+char intToChar(int input) {
+  if (input < 10) return input + '0';
+  else return input - 9 + 'a';
+}

Lab 9/task_1.c

+#include <stdio.h>
+#include <math.h>
+
+int main() {
+  float a, b;
+
+  char action;
+  printf("Please input action (* / + -): ");
+  action = getchar();
+
+  printf("Please input first number: ");
+  scanf("%f", &a);
+
+  printf("Please input second number: ");
+  scanf("%f", &b);
+
+  switch (action) {
+    case '+':
+      printf("%f\n", a + b);
+      break;
+    case '-':
+      printf("%f\n", a - b);
+      break;
+    case '*':
+      printf("%f\n", a * b);
+      break;
+    case '/':
+      printf("%f\n", a / b);
+      break;
+    default:
+      printf("Invalid action!");
+      break;
+  }
+  return 0;
+}

Lab 9/task_2.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+float average(int*, int);
+int max(int*, int);
+int min(int*, int);
+
+int main() {
+  int size = 1;
+  int location = 0;
+
+  char* array = malloc(size * sizeof(char));
+
+  printf("Please input an array of int, with space seperator:\n");
+  char c;
+  while ((c = getchar()) != 10) {
+    array[location++] = c;
+    if (location >= size) {
+      size++;
+      array = realloc(array, size * sizeof(char));
+    }
+  }
+  array[location] = '\0';
+  size = 1;
+  location = 0;
+
+  int* numberList = malloc(size * sizeof(int));
+  char* currentWord = strtok(array, " ");
+  while (currentWord != NULL) {
+    numberList[location++] = atoi(currentWord);
+    currentWord = strtok(NULL, " ");
+    if (location >= size) {
+      size++;
+      numberList = realloc(numberList, size * sizeof(int));
+    }
+  }
+  char input[4];
+  printf("Input method (max, min, avr): ");
+  scanf("%s", &input);
+  if (strncmp(input, "max", 3) == 0) {
+    printf("%d\n", max(numberList, location));
+  } else if (strncmp(input, "min", 3) == 0) {
+    printf("%d\n", min(numberList, location));
+  } else if (strncmp(input, "avr", 3) == 0) {
+    printf("%f\n", average(numberList, location));
+  } else {
+    printf("Invalid bullshit\n");
+  }
+
+  free(numberList);
+  free(array);
+  return 0;
+}
+
+float average(int* array, int length) {
+  float sum = 0;
+  for (int i = 0; i < length; i++) {
+    sum += array[i];
+  }
+  return (float)(sum / length);
+}
+
+int max(int* array, int length) {
+  int largest = array[0];
+  for (int i = 1; i < length; i++) {
+    if (largest < array[i]) largest = array[i];
+  }
+  return largest;
+}
+
+int min(int* array, int length) {
+  int smallest = array[0];
+  for (int i = 1; i < length; i++) {
+    if (smallest > array[i]) smallest = array[i];
+  }
+  return smallest;
+}

Lab 9/task_3.c

+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int custom_isnan(char*);
+
+int main() {
+  char input[1000];
+  printf("Please input something: ");
+  scanf("%s", &input);
+
+  if (custom_isnan(input)) {
+    puts("Not a number!");
+  } else {
+    printf("%s is a number!\n", input);
+  }
+  return 0;
+}
+
+int custom_isnan(char* input) {
+  int length = strlen(input);
+  int end = 0;
+  for (int i = 0; i < length && !end; i++) {
+    char c = input[i];
+    if (!(c >= '0' && c <= '9')) {
+      if (c != '.') {
+        end = 1;
+      }
+    }
+  }
+  if (end) return 1;
+  return 0;
+}

Lab 9/task_4.c

+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int custom_isnan(char*, int);
+
+int main() {
+  char input[1000];
+  printf("Please input something: ");
+  scanf("%s", &input);
+
+  int base;
+  printf("Please input base number: ");
+  scanf("%d", &base);
+
+  if (custom_isnan(input, base)) {
+    puts("Not a number!");
+  } else {
+    printf("%s is a number!\n", input);
+  }
+  return 0;
+}
+
+int custom_isnan(char* input, int base) {
+  int length = strlen(input);
+  int end = 0;
+  for (int i = 0; i < length && !end; i++) {
+    char c = input[i];
+    int number = c - '0';
+    if (base <= 10) {
+      if (!(number >= 0 && number < base)) {
+        end = 1;
+      }
+    } else {
+      if (!(number >= 0 && number < base)) {
+        int after10 = c - 'a';
+        if (!(after10 >= 0 && after10 < (base - 10))) {
+          end = 1;
+        }
+      }
+    }
+  }
+  if (end) return 1;
+  return 0;
+}