.

bac2/os/chap0/build.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+for i in $(ls *.c); do
+	gcc $i -o $(echo $i | cut -d '.' -f 1)
+done

bac2/os/chap0/ex1.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+unsigned int string_length(char string[]);
+
+int main(int argc, char *argv[])
+{
+	printf("%d", string_length("test"));
+	return 0;
+}
+
+unsigned int string_length(char string[]){
+	int i = 0;
+	while(string[i] != '\0'){
+		i++;
+	}
+	return i;
+}

bac2/os/chap0/ex2.c

@@ -0,0 +1,22 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+void capitalize(char string[]);
+
+int main(int argc, char *argv[])
+{
+	char test[] = "test";
+	printf("%s\n", test);
+	capitalize(test);
+	printf("%s\n", test);
+	return 0;
+}
+
+void capitalize(char string[]){
+	int i = 0;
+	while(string[i] != '\0'){
+		string[i] = string[i] + 'A' - 'a';
+		i++;
+	}
+}

bac2/os/chap0/ex3.c

@@ -0,0 +1,24 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+void replace(char string[], char target, char replacement);
+
+int main(int argc, char *argv[])
+{
+	char test[] = "test";
+	printf("%s\n", test);
+	replace(test, 'e', 'a');
+	printf("%s\n", test);
+	return 0;
+}
+
+void replace(char string[], char target, char replacement){
+	int i = 0;
+	while(string[i] != '\0'){
+		if(string[i] == target){
+			string[i] = replacement;
+		}
+		i++;
+	}
+}

bac2/os/chap0/ex4.c

@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+void delete(char string[], char target);
+
+int main(int argc, char *argv[])
+{
+	char test[] = "test test";
+	printf("%s\n", test);
+	delete(test, 'e');
+	printf("%s\n", test);
+	return 0;
+}
+
+void delete(char string[], char target){
+	int i = 0, offset = 0;
+	while(string[i] != '\0'){
+		if(string[i+offset] == target){
+			offset++;
+		}
+		string[i] = string[i+offset];
+		i++;
+	}
+	string[i] = '\0';
+}

bac2/os/chap0/ex5.c

@@ -0,0 +1,22 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+
+void print_type_stats();
+
+int main(int argc, char *argv[])
+{
+	print_type_stats();
+	return 0;
+}
+
+void print_type_stats(){
+	printf("int -> %.f\n", pow(2, (sizeof(int) * 8)));
+	printf("uint -> %.f\n", pow(2, (sizeof(unsigned int) * 8)));
+	printf("short -> %.f\n", pow(2, (sizeof(short) * 8)));
+	printf("long -> %.f\n", pow(2, (sizeof(long) * 8)));
+	printf("float -> %.f\n", pow(2, (sizeof(float) * 8)));
+	printf("double -> %.f\n", pow(2, (sizeof(double) * 8)));
+
+}

bac2/os/chap0/ex6.c

@@ -0,0 +1,23 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+unsigned int count_char_occurence(char string[], char target);
+
+int main(int argc, char *argv[])
+{
+	char test[] = "test test";
+	printf("%s -> %d\n", test, count_char_occurence(test, 't'));
+	return 0;
+}
+
+unsigned int count_char_occurence(char string[], char target){
+	int i = 0, ret = 0;
+	while(string[i] != '\0'){
+		if(string[i] == target){
+			ret++;
+		}
+		i++;
+	}
+	return ret;
+}

bac2/os/chap0/ex7.c

@@ -0,0 +1,37 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+unsigned int count_word_occurence(char string[], char target[]);
+
+int main(int argc, char *argv[])
+{
+	char test[] = "I am a test and im diggin a test... diggy diggy test...";
+	printf("%s -> %d\n", test, count_word_occurence(test, "test"));
+	return 0;
+}
+
+unsigned int count_word_occurence(char string[], char target[]){
+	int sizeoftarget = 0;
+	while(target[sizeoftarget] != '\0'){
+		sizeoftarget++;
+	}
+
+	int i = 0, ret = 0;
+	while(string[i] != '\0'){
+		if(string[i] == target[0]){
+			int check = 0;
+			for (int j = 0; j < sizeoftarget; ++j) {
+				if(target[j] == string[i+j]){
+					continue;
+				}
+				check = 1;
+			}
+			if(!check){
+				ret++;
+			}
+		}
+		i++;
+	}
+	return ret;
+}

bac2/os/chap0/ex8.c

@@ -0,0 +1,34 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+void print_histogram(char string[]);
+
+int main(int argc, char *argv[])
+{
+	char test[] = "I am a test and im diggin a test... diggy diggy test...";
+	printf("%s\n",test);
+	print_histogram(test);
+	return 0;
+}
+
+void print_histogram(char string[]){
+	char num_letters['z' - 'a'];
+	for(char i = 0; i <= 'z' - 'a'; i++){
+		num_letters[i] = 0;
+	}
+	char i = 0;
+	while(string[i] != '\0'){
+		if(string[i] >= 'a' && string[i] <= 'z'){
+			num_letters[string[i]-'a']++;
+		}
+		i++;
+	}
+
+	for(char i = 0; i <= 'z' - 'a'; i++){
+		if(num_letters[i] != 0){
+			printf("%c -> %d\n", i + 'a', num_letters[i]);
+		}
+	}
+
+}