Julia Tan - Assignment 8

assignment7.txt

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+Julia Tan
+
+1. CAN CRASH
+- while loop does not check for whether the condition is true or false, instead sets a value
+- *p in for loop is not a condition
+
+2. 4 bytes
+Because that is the size of one char pointer.
+
+3. lines 18-24, 29-30
+
+4. Between 32 and 33: free(*p);
+14: single quotes around 0
+I'm not sure how to fix the while loop and for loop sorry

fileIO.txt

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+4
+1
+2
+3
+4

file_IO.c

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+#include <stdio.h>
+#include <math.h>
+
+int main(){
+	FILE *file;
+	float num = 0;
+	float list[4];
+	int listNum = 0;
+	float total = 0;
+	float mean = 0;
+	file = fopen("fileIO.txt", "r");
+	while (fscanf(file, "%f", &num) != EOF){
+		printf("%.2f\n", num);
+		list[listNum] = num;
+		listNum ++;
+	}
+	printf("\n");
+	for (int i = 1; i < 5; i ++){ // calculating total
+		total += list[i];
+	}
+	mean = total / list[0]; // calculating mean
+	printf("The mean is: %.2f.\n", mean);
+	// calculating standard deviation
+	total = 0;
+	for (int i = 1; i < 5; i ++){
+		float x = list[i]-mean;
+		total += (x*x);
+	}
+	mean = total / list[0];
+	printf("Standard deviation is: %.2f.\n",(mean));
+	fclose(file);
+	return 0;
+}

sort.c

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+// Julia Tan
+// sort.c
+
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+
+int main(){
+	int array_size;
+	int *array_1;
+	int *array_2;
+	int *array_3;
+	int i = 0;
+	srand(time(0));
+	printf("How many numbers do you want?\n");
+	scanf("%d", &array_size);
+	array_1 = (int *)malloc(sizeof(int)*array_size);
+	array_2 = (int *)malloc(sizeof(int)*array_size);
+	array_3 = (int *)malloc(sizeof(int)*array_size);
+
+	// check if there is enough memory
+	if ((array_1 = (int *)malloc(sizeof(int)*array_size)) == NULL)
+		printf("array_1 cannot be allocated memory.");
+	if ((array_1 = (int *)malloc(sizeof(int)*array_size)) == NULL)
+		printf("array_2 cannot be allocated memory.");
+	if ((array_1 = (int *)malloc(sizeof(int)*array_size)) == NULL)
+		printf("array_3 cannot be allocated memory.");
+
+	// add random numbers into arrays
+	for (i = 0; i < array_size; i++){
+		array_1[i] = rand();
+		array_2[i] = array_1[i];
+		array_3[i] = array_1[i];
+		printf("array[%d] = %d\n", i, array_1[i]);
+	}
+
+	// sort numbers by ascending or descending
+	for (i = 0; i < array_size; i++){
+		for (int j = i + 1; j < array_size; j++){ //ascending
+			if (array_2[j] < array_2[i]){
+				int temp = array_2[i];
+				array_2[i] = array_2[j];
+				array_2[j] = temp;
+			}
+		}
+	}
+	for (i = 0; i < array_size; i++){
+		for (int j = i + 1; j < array_size; j++){ //descending
+			if (array_3[j] > array_3[i]){
+				int temp = array_3[i];
+				array_3[i] = array_3[j];
+				array_3[j] = temp;
+			}
+		}
+	}
+	// print sorted array
+	printf("First array, no sorting:\n");
+	for (i = 0; i < array_size; i++){
+		printf("%d\n",array_1[i]);
+	}
+	printf("Second array, ascending:\n");
+	for (i = 0; i < array_size; i++){
+		printf("%d\n", array_2[i]);
+	}
+	printf("Third array, descending:\n");
+	for (i = 0; i < array_size; i++){
+		printf("%d\n", array_3[i]);
+	}
+
+	free(array_1);
+	free(array_2);
+	free(array_3);
+	printf("%d",'a');
+	return 0;
+}