Assignment 4

arrayfreq.c

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+/* Christopher Liu */
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+	char string[100] = {};
+	char reference[53] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"};
+
+	int counter[53] = {}; 
+	for (int i = 0; i < (int) strlen(string); i++)
+	{
+		counter[i] = 0;
+	}
+
+
+	printf("Enter string: ");
+	fgets(string, sizeof(string), stdin);
+	string[strlen(string)-1] = '\0';
+
+	for (int i = 0; i < (int) strlen(string); i++)
+	{
+		for (int j = 0; j < (int) strlen(reference); j++)
+		{
+			if (string[i] == reference[j])
+			{
+				counter[j] += 1;
+			}
+		}
+	}
+
+	for (int i = 0; i < (int) sizeof(counter)/4; i++)
+	{
+		if (counter[i] != 0)
+		{
+			printf("%c: %d\n", reference[i], counter[i]);
+		}
+	}
+	return 0;
+}

arraysum.c

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+/* Christopher Liu - I didn't get the instructions so I'm not sure if I interpreted it correctly*/
+#include <stdio.h>
+
+int main()
+{
+	printf("Size of array: ");
+
+	int array_size;
+	scanf("%d", &array_size);
+
+	int input_array[array_size], sum_array[array_size], sum = 0;
+
+	for (int i = 0; i < array_size; i++)
+	{
+		printf("Input number at index %d: ", input_array[i]);
+		scanf("%d", &input_array[i]);
+		sum += input_array[i];
+	}
+
+	int ignored;
+	printf("Ignore which index? ");
+	scanf("%d", &ignored);
+	sum -= input_array[ignored];
+
+	for (int i = 0; i < array_size; i++)
+	{
+		sum_array[i] = sum;	
+		printf("Value of array index %d: %d\n", i, sum_array[i]); 
+	}
+	return 0;
+}

arraytrim.c

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+/* Christopher Liu - I wasn't sure how to delete a value from an array so I just set it to zero. Sorry */
+#include <stdio.h>
+
+int main()
+{
+	printf("Size of array: ");
+
+	int array_size;
+	scanf("%d", &array_size);
+
+	int input_array[array_size], trimmed_array[array_size];
+
+	for (int i = 0; i < array_size; i++)
+	{
+		printf("Input number at index %d: ", input_array[i]);
+		scanf("%d", &input_array[i]);
+		trimmed_array[i] = input_array[i];
+	}
+
+	for (int i = 0; i < array_size; i++)
+	{
+		for (int j = 0; j < array_size; j++)
+		{
+			printf("%d:%d i, %d:%d j\n", i, input_array[i], j, input_array[j]);
+			if (input_array[i] == input_array[j] && i != j)
+			{
+				trimmed_array[i] = 0;	
+			}
+		}
+		printf("Value of array index %d: %d\n", i, trimmed_array[i]); 
+	}
+	return 0;
+}

assignment4.txt

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+Christopher Liu - I didn't get question 3
+1. A string allows you to use string operations, and ends with '\0'.
+2. Arrays are useful because they're an organized way to create a bunch of variables with the same type. Disadvantages are the size of arrays cannot be changed, and all the variables of the array must be the same type.
+3. It does not implicitly generate the address of an array when it is used in an operator such as sizeof()
+4. You would use strcmp() after including string.h. The function will return zero if the strings are equivalent in content.

hangman.c

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+/* Christopher Liu - wasn't sure how to end the game if you won, and the try counter is messed up */
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+	char hangword[7] = "eighth";
+	int guessed[6] = {0,0,0,0,0,0}, tries = 0;
+
+	while (tries <= 10)
+	{
+		printf("Tries: %d/10\n", tries);
+		printf("Current board state: \n");
+		for (int i = 0; i < (int) strlen(hangword); i++)
+		{
+			if (guessed[i])
+			{
+				printf("%c ", hangword[i]);
+			}
+			else
+			{
+				printf("_ ");
+			}
+		}
+		printf("\n");
+
+		printf("Guess a letter: ");
+		char guess;
+		scanf("%c", &guess);
+
+		for (int i = 0; i < (int) strlen(hangword); i++)
+		{
+			if (guess == hangword[i])
+			{
+				guessed[i] = 1;
+			}
+		}
+
+		int check_won = 0;
+		for (int i = 0; i <= (int) sizeof(guessed)/4; i++)
+		{
+			if (guessed[i] == 1) check_won++;
+
+		}
+		if (check_won == 6) 
+		{
+			printf("You won!\n");
+			break;
+		}
+		tries++;
+	}
+	printf("no more tries\n");
+}