IZP/Cviko4_2/main.c

#include "types.h"
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>

/**
 * Get the largest value in the provided array
 *
 * @note We assume the array is not empty!
 *
 * @param array Source integer array
 * @param length Size of the array
 *
 * @return the largest value in the provided array
 */
int get_max(int array[], int length) {
  // TODO: 1. Find the largest value in the array
  //   be mindful of possible array values
  //   (eg. they may all be negative or extremely large)
  int result = INT_MIN;
  for (int i = 0; i < length; ++i) {
    if (array[i] > result) {
      result = array[i];
    }
  }

  // TODO: 2. Return the value found
  return result;
}

/**
 * Get the sum of all values in the provided array
 *
 * @param array Source integer array
 * @param length Size of the array
 *
 * @return sum of all values in the array
 */
int get_sum(int array[], int length) {
  // TODO: 1. Sum up all the values of the array
  int result = 0;
  for (int i = 0; i < length; ++i) {
    result += array[i];
  }
  // TODO: 2. Return the value
  return result;
}

/**
 * Check that for all indices (plural of index),
 *   array1 has smaller values than array2
 *
 * @example
 * arr1: [2, 4, 1, 10, -5]
 * arr2: [8, 9, 2, 99, -1]
 *        ^  ^  ^  ^^  ^^
 *
 * @example
 * arr1: [2, 4, 9, 10, -5]
 * arr2: [8, 9, 2, 99, -1]
 *        ^  ^  x
 *
 * @note We assume the arrays are of the same length!
 *
 * @param array1 First integer array
 * @param array2 Second integer array
 * @param array_length Length of both arrays
 *
 * @return true when all values at all indices of array1 are
 *    smaller than corresponding values from array2;
 *    false otherwise
 */
bool values_are_smaller_than(int array1[], int array2[], int array_length) {
  // TODO: 1. Iterate over all the array items and compare
  //   values from array1 with corresponding ones in array2
  bool result = true;
  for (int i = 0; i < array_length; ++i) {
    if(array1[i] >= array2[i]){
        result = false;
        break;
    }
  }

  // TODO: 2. Return false when there is value in array1
  //    larger than corresponding one in array2

  // TODO: 3. Return true when all the items have been checked

  return result;
}

#ifndef TEST_BUILD

int main() {
  int arr1[5];

  printf("Please select five numbers: ");
  for (int index = 0; index < 5; index++) {
    scanf("%d", &arr1[index]);
  }

  // We can either save the maximum value into our new variable and then use it
  // later
  int arr_max = get_max(arr1, 5);
  printf("Maximum array value: %d\n", arr_max);

  // Or we can use the function call directly = function call is an expression!
  printf("Sum of array values: %d\n", get_sum(arr1, 5));

  // Read another five numbers so that we can test the smaller_than function
  int arr2[5];
  printf("Please select another five numbers: ");
  for (int index = 0; index < 5; index++) {
    scanf("%d", &arr2[index]);
  }

  // We do not actually have to use the return value
  // We have seen this before with functions such as printf and scanf
  // - they also have a return value!
  if (values_are_smaller_than(arr1, arr2, 5)) {
    printf("The first array is smaller than the second.\n");
  } else {
    printf("The first array is not smaller than the second.\n");
  }

  return 0;
}

#endif