18 files changed, 423 insertions(+), 0 deletions(-)

A airline_system/Makefile
A airline_system/airline_system.c
A count/Makefile
A count/count.c
A lc/Makefile
A lc/lc.c
A lc/test.txt
A mailing_labels/Makefile
A mailing_labels/mailing_labels.c
A point_first_char/Makefile
A point_first_char/point_first_char.c
A snake_case/Makefile
A snake_case/snake_case.c
A wc/Makefile
A wc/wc.c
A xref/Makefile
A zero_array/Makefile
A zero_array/zero_array.c

@@ 0,0 1,6 @@
+# Makefile for airline_system
+
+# Turn on debugging
+$CFLAGS=-g
+airline_system:airline_system.o
+	$(CC) $(CFLAGS) -o airline_system airline_system.o

@@ 0,0 1,49 @@
+/****************************************
+* airline_system - airline reservation	*
+*   system				*
+* Usage: Enter two airport codes at	*
+*   prompt				*
+****************************************/
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_ENTRIES 50
+
+int main(void) {
+	char line[100];	/* user input line */
+	int counter = 0; /* for loop counter */
+	char search_originating_code[3];
+	char search_destination_code[3];
+
+	struct airline_index {
+		int flight_number;	
+		char originating_code[3];	/* three character departing abbreviation */
+		char destination_code[3];
+		char departure_time[5];		/* in the format XX:XX */
+		char arrival_time[5];
+	} reservation_data = {
+		8025,
+		"PDX",
+		"DFW",
+		1845,
+		2250
+	};
+
+	/* Receive user input */
+	for (counter = 0; counter < MAX_ENTRIES; counter++) {
+		printf("Originating airport code (e.g. PDX): ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%s", search_originating_code);
+
+		if (strcmp(search_originating_code, "") == 0)
+			break;
+	}
+
+	for (counter = 0; counter < MAX_ENTRIES; counter++) {
+		if (strcmp(reservation_data[counter].originating_code, search_originating_code) == 0)
+			printf("%d, %s, %s, %s, %s", reservation_data[counter].flight_number, reservation_data[counter].originating_code, reservation_data[counter].destination_code, reservation_data[counter].departure_time, reservation_data[counter].arrival_time); 
+	}
+
+	return (0);
+}
+

@@ 0,0 1,6 @@
+# Makefile for the program count
+
+# Turn on debugging
+$CFLAGS=-g
+count:count.o
+	$(CC) $(CFLAGS) -o count count.o

@@ 0,0 1,37 @@
+/****************************************
+* count -- count number of times value	*
+*   appears in array			*
+****************************************/
+#include <stdio.h>
+
+/****************************************
+* count -- count values in array	*
+* Parameters				*
+*   number -- number to count		*
+*   array -- array to be searched	*
+*   length -- length of array		*
+* Returns				*
+*   instances -- number of times value	*
+*     appears in array			*
+****************************************/
+int count(int number, int array[], int length) {
+	if (array[0] == 0)
+		return (0);
+
+	if (array[0] == number)
+		return 1 + count(number, array + 1, length - 1);
+	/* else */
+	return count(number, array+1, length - 1);
+}
+
+int main(void) {
+	int array[] = {1, 2, 3, 4, 3, 2, 1};
+	int length = sizeof(array) / sizeof(array[0]);
+	int number = 3;
+
+	int frequency = count(number, array, length);
+
+	printf("The number %d appears %d times in the array.\n", number, frequency);
+
+	return (0);
+}

@@ 0,0 1,6 @@
+# Makefile for the program lc
+
+# Turn on debugging
+CFLAGS=-g
+lc:lc.o
+	$(CC) $(CFLAGS) -o lc lc.o

@@ 0,0 1,59 @@
+/****************************************
+* lc -- count lines in a file		*
+* Usage: Input filename at prompt	*
+****************************************/
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h> /* exit function */
+
+/****************************************
+* line_count -- count lines in a file	*
+* Parameter				*
+*   filename -- file to be counted	*
+* Returns				*
+*   lc -- integer number of lines in	*
+*	  file string			*
+****************************************/
+int line_count(char filename[]) {
+	FILE *input_file; /* input file */
+	int lc = 0; /* line count */
+	int ch = 0; /* character or EOF flag from input */
+
+	input_file = fopen(filename, "r");
+
+	if (input_file == NULL) {
+		printf("Can not open file: %s\n", filename);
+		exit(8);
+	}
+
+	while (1) {
+		ch = fgetc(input_file);
+
+		/* stop counting at EOF */
+		if (ch == EOF)
+			break;
+
+		/* increment lc on new line */
+		if (ch == '\n')
+			lc++;
+	}
+
+	return lc;
+}
+
+int main(void) {
+	char line[100]; /* input buffer */
+	char filename[100]; /* input file name */
+
+	printf("Enter a filename: ");
+	fgets(line, sizeof(line), stdin);
+	sscanf(line, "%s", filename);
+
+	/* Count words in text */
+	int lc = line_count(filename);
+
+	printf("Line count: %d\n", lc);
+
+	return (0);
+}
+

@@ 0,0 1,5 @@
+test
+test
+test
+test
+test

@@ 0,0 1,6 @@
+# Makefile for mailing_labels
+
+# Turn on debugging
+$CFLAGS=-g
+mailing_labels:mailing_labels.o
+	$(CC) $(CFLAGS) -o mailing_labels mailing_labels.o

@@ 0,0 1,60 @@
+/****************************************
+* mailing_labels - generate mailing	*
+*   labels from names and addresses	*
+* Usage: Input name and address at	*
+*   prompt, entering a blank line to	*
+*   complete list			*
+****************************************/
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_ENTRIES 50
+
+int main(void) {
+	char line[100];	/* user input line */
+	int counter = 0; /* for loop counter */
+
+	struct mailing {
+		char name[30]; /* name of person */
+		char address1[60]; /* Two lines of street address */
+		char address2[60];
+		char city[40];
+		char state[2];	/* two character abbreviation */
+		int zip;	/* numeric zip code */
+	};
+
+	struct mailing list[MAX_ENTRIES];
+
+	/* Receive user input */
+	for (counter = 0; counter < MAX_ENTRIES; counter++) {
+		printf("Name: ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%s", list[counter].name);
+
+		if (strcmp(list[counter].name, "") == 0)
+			break;
+
+		printf("Address first line: ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%s", list[counter].address1);
+
+		printf("Address second line: ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%s", list[counter].address2);
+
+		printf("City: ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%s", list[counter].city);
+
+		printf("State (e.g. OR): ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%s", list[counter].state);
+
+		printf("Zip code: ");
+		fgets(line, sizeof(line), stdin);
+		sscanf(line, "%d", &list[counter].zip);
+	}
+
+	return (0);
+}
+

@@ 0,0 1,6 @@
+# Makefile for point_first_char
+
+# Turn on debugging
+CFLAGS=-g
+point_first_char:point_first_char.o
+	$(CC) $(CFLAGS) -o point_first_char point_first_char.o

@@ 0,0 1,35 @@
+/****************************************
+* point_first_char -- return pointer to	*
+*   first nonwhite character in string	*
+* Usage: Enter string at prompt		*
+****************************************/
+#include <stdio.h>
+#define MAX 10
+
+void first_nonwhitespace(char *str_ptr) {
+	int index; /* counts which array element is being operated on */
+
+	for (index = 0; *str_ptr != '\0' ; index++) {
+		break;
+	}
+	str_ptr++;
+}
+
+int main(void) {
+	char line[100]; /* user input buffer */
+	char str[100]; /* string input by user */
+
+	/* array containing data to zero */
+	printf("Input string: ");
+	fgets(line, sizeof(line), stdin);
+	sscanf(line, "%s", str);
+
+	/* call function with a pointer to first element of array */
+	first_nonwhitespace(str);
+
+	printf("%s\n", str);
+
+	return (0);
+}
+
+

@@ 0,0 1,6 @@
+# Makefile for snake_case
+
+# Turn on debugging
+$CFLAGS=-g
+snake_case:snake_case.o
+	$(CC) $(CFLAGS) -o snake_case snake_case.o

@@ 0,0 1,45 @@
+/****************************************
+* snake_case - convert text from kebab-	*
+*   case to snake_case			*
+* Usage: Input string at prompt		*
+****************************************/
+#include <stdio.h>
+#include <string.h>
+
+int main(void) {
+	char kebab_case[100]; /* Text before conversion */
+	char convert_snake_case(char kebab_case[]); /* Convert snake case function prototype */
+
+	/* Receive user input */
+	printf("Input text: ");
+	fgets(kebab_case, sizeof(kebab_case), stdin);
+
+	convert_snake_case(kebab_case);
+	/* Print result */
+	printf("%s", kebab_case);
+	return (0);
+}
+
+/****************************************
+* convert_snake_case -- replace all	*
+*   occurrences of '-' with '_'		*
+* Parameter				*
+*   kebab_case -- text to be converted	*
+* Returns				*
+*   snake_case -- converted text	*
+****************************************/
+char convert_snake_case(char kebab_case[]) {
+	int counter = 0;
+	char snake_case[100];
+
+	for (counter = 0; kebab_case[counter] != '\0'; counter++) {
+		if (kebab_case[counter] == '-')
+			snake_case[counter] = '_';
+		else
+			snake_case[counter] = kebab_case[counter];
+	}
+
+	strcpy(kebab_case, snake_case);
+
+	return snake_case[100];
+}

@@ 0,0 1,6 @@
+# Makefile for the program wc
+
+# Turn on debugging
+CFLAGS=-g
+wc:wc.o
+	$(CC) $(CFLAGS) -o wc wc.o

@@ 0,0 1,42 @@
+/****************************************
+* wc -- simple word counter		*
+* Usage: Input string at prompt		*
+* Notes: A "word" is defined as a	*
+*   collection of characters separated	*
+*   by a space or hyphen.		*
+****************************************/
+#include <stdio.h>
+#include <string.h>
+
+/****************************************
+* word_count -- count words in a string	*
+* Parameter				*
+*   text -- string to be counted	*
+* Returns				*
+*   wc -- integer count of words in	*
+*	  string			*
+****************************************/
+int word_count(char text[]) {
+	int wc = 0;
+	int counter = 0;
+
+	for (counter = 0; text[counter] != '\0'; counter ++) {
+		if (text[counter] == ' ')
+		wc++;
+	}
+
+	return wc;
+}
+
+int main(void) {
+	char text[100];
+
+	/* Count words in text */
+	int word_count(char text[]);
+
+	printf("Enter a sentence: ");
+	fgets(text, sizeof(text), stdin);
+
+	printf("%d", word_count(text[100]));
+	return (0);
+}

@@ 0,0 1,6 @@
+# Makefile for program xref
+
+# Turn on debugging
+$CFLAGS=-g
+xref:xref.o
+	$(CC) $(CFLAGS) -o xref xref.o

@@ 0,0 1,6 @@
+# Makefile for zero_array
+
+# Turn on debugging
+$CFLAGS=-g
+zero_array:zero_array.o
+	$(CC) $(CFLAGS) -o zero_array zero_array.o

@@ 0,0 1,37 @@
+/****************************************
+* point_first_char -- return pointer to *
+*   first nonwhite character in string   *
+* Usage: Enter string at prompt         *
+****************************************/
+#include <stdio.h>
+#define MAX 10
+
+void first_nonwhitespace(char *str_ptr) {
+    int index; /* counts which array element is being operated on */
+
+    for (index = 0; index < MAX; index++) {
+        *str_ptr = "test";
+        break;
+    }
+}
+
+int main(void) {
+    char line[100]; /* user input buffer */
+    char str[100]; /* string input by user */
+    char *str_ptr; /* pointer to string */
+
+    /* array containing data to zero */
+    printf("Input string: ");
+    fgets(line, sizeof(line), stdin);
+    sscanf(line, "%s", str);
+
+    /* assign address of str to str_ptr */
+    str_ptr = str;
+
+    /* call function with a pointer to first element of array */
+    first_nonwhitespace(str_ptr);
+
+    printf("%s", str_ptr);
+
+    return (0);
+}