Moved files of Assignment 1, Started Assignment 2

Assignment 1/excercise3/exercise3b.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main (int argc , char** argv ){
+	
+	// Open file for reading 
+	// We are opening a device file for reading ,
+	// which is like reading from a file but the file is not necessarily an actual file on disk.
+	// instead it could be some sort of external device or a simple piece of software returning bytes to us
+	FILE* fp = fopen("/dev/urandom", "r");	
+	if( !fp){
+		perror("File opening failed!");	
+		return EXIT_FAILURE;
+	}
+
+	while ( 1 ){
+		char random =  fgetc(fp);	
+		if ( random == 42 ){
+			break;
+		}
+		printf("Read 0x%x %u %d from /dev/urandom\n", random, random , random);
+	//	getchar();	
+
+	}
+	fclose(fp);
+}

Assignment 1/excercise3/exercise3d.c

@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+int main (int argc , char** argv){
+	uint16_t number;
+	FILE* urandomFile = fopen( "/dev/urandom" , "r");
+	if( !urandomFile ){
+		perror("Could not open file for reading...");
+		return EXIT_FAILURE;
+	}	
+
+	while(1){
+		fread( &number, sizeof(uint16_t), 1, urandomFile);
+		if( number == 42){
+			break;
+		}
+		printf( "0x%x %u %d\n" , number, number, number );
+	
+	}
+	fclose(urandomFile);
+
+
+}
+
+

Assignment 1/excercise3/lines.txt

@@ -0,0 +1,10 @@
+1537
+12731
+5948
+56298
+162176
+13281
+18465
+97358
+172118
+115888

Assignment 1/exercise3c

@@ -0,0 +1,215 @@
+Read 0xffffff8f 4294967183 -113 from /dev/urandom
+Read 0xfffffffa 4294967290 -6 from /dev/urandom
+Read 0x78 120 120 from /dev/urandom
+Read 0xffffffc4 4294967236 -60 from /dev/urandom
+Read 0xffffffe8 4294967272 -24 from /dev/urandom
+Read 0x18 24 24 from /dev/urandom
+Read 0x70 112 112 from /dev/urandom
+Read 0xffffffab 4294967211 -85 from /dev/urandom
+Read 0x5c 92 92 from /dev/urandom
+Read 0xf 15 15 from /dev/urandom
+Read 0x49 73 73 from /dev/urandom
+Read 0x40 64 64 from /dev/urandom
+Read 0x6c 108 108 from /dev/urandom
+Read 0xffffffa1 4294967201 -95 from /dev/urandom
+Read 0x75 117 117 from /dev/urandom
+Read 0x58 88 88 from /dev/urandom
+Read 0xfffffff6 4294967286 -10 from /dev/urandom
+Read 0xffffffec 4294967276 -20 from /dev/urandom
+Read 0x6d 109 109 from /dev/urandom
+Read 0xffffffb2 4294967218 -78 from /dev/urandom
+Read 0xfffffff9 4294967289 -7 from /dev/urandom
+Read 0x17 23 23 from /dev/urandom
+Read 0xffffffc4 4294967236 -60 from /dev/urandom
+Read 0x62 98 98 from /dev/urandom
+Read 0xffffff80 4294967168 -128 from /dev/urandom
+Read 0xffffff9e 4294967198 -98 from /dev/urandom
+Read 0x13 19 19 from /dev/urandom
+Read 0xffffffc6 4294967238 -58 from /dev/urandom
+Read 0x7d 125 125 from /dev/urandom
+Read 0x47 71 71 from /dev/urandom
+Read 0x4d 77 77 from /dev/urandom
+Read 0x71 113 113 from /dev/urandom
+Read 0x16 22 22 from /dev/urandom
+Read 0x65 101 101 from /dev/urandom
+Read 0xffffffae 4294967214 -82 from /dev/urandom
+Read 0xffffffb3 4294967219 -77 from /dev/urandom
+Read 0xffffffa8 4294967208 -88 from /dev/urandom
+Read 0xffffff94 4294967188 -108 from /dev/urandom
+Read 0x72 114 114 from /dev/urandom
+Read 0xfffffff9 4294967289 -7 from /dev/urandom
+Read 0xffffff9d 4294967197 -99 from /dev/urandom
+Read 0x35 53 53 from /dev/urandom
+Read 0x69 105 105 from /dev/urandom
+Read 0x20 32 32 from /dev/urandom
+Read 0x7 7 7 from /dev/urandom
+Read 0x2d 45 45 from /dev/urandom
+Read 0x31 49 49 from /dev/urandom
+Read 0x5c 92 92 from /dev/urandom
+Read 0xfffffffd 4294967293 -3 from /dev/urandom
+Read 0x37 55 55 from /dev/urandom
+Read 0xffffffde 4294967262 -34 from /dev/urandom
+Read 0x58 88 88 from /dev/urandom
+Read 0x29 41 41 from /dev/urandom
+Read 0x42 66 66 from /dev/urandom
+Read 0xffffffa8 4294967208 -88 from /dev/urandom
+Read 0x13 19 19 from /dev/urandom
+Read 0x8 8 8 from /dev/urandom
+Read 0x9 9 9 from /dev/urandom
+Read 0x6d 109 109 from /dev/urandom
+Read 0x6a 106 106 from /dev/urandom
+Read 0x6f 111 111 from /dev/urandom
+Read 0x38 56 56 from /dev/urandom
+Read 0x57 87 87 from /dev/urandom
+Read 0xffffffce 4294967246 -50 from /dev/urandom
+Read 0xffffffb3 4294967219 -77 from /dev/urandom
+Read 0x68 104 104 from /dev/urandom
+Read 0xffffffad 4294967213 -83 from /dev/urandom
+Read 0xffffffa0 4294967200 -96 from /dev/urandom
+Read 0x34 52 52 from /dev/urandom
+Read 0xffffffff 4294967295 -1 from /dev/urandom
+Read 0x4e 78 78 from /dev/urandom
+Read 0xffffff84 4294967172 -124 from /dev/urandom
+Read 0xffffffe9 4294967273 -23 from /dev/urandom
+Read 0x7e 126 126 from /dev/urandom
+Read 0xffffffaa 4294967210 -86 from /dev/urandom
+Read 0xffffffc3 4294967235 -61 from /dev/urandom
+Read 0xffffffc3 4294967235 -61 from /dev/urandom
+Read 0x77 119 119 from /dev/urandom
+Read 0x72 114 114 from /dev/urandom
+Read 0xffffff9b 4294967195 -101 from /dev/urandom
+Read 0xfffffff9 4294967289 -7 from /dev/urandom
+Read 0xffffffc9 4294967241 -55 from /dev/urandom
+Read 0xffffffda 4294967258 -38 from /dev/urandom
+Read 0xffffff8b 4294967179 -117 from /dev/urandom
+Read 0x58 88 88 from /dev/urandom
+Read 0x17 23 23 from /dev/urandom
+Read 0xffffffb9 4294967225 -71 from /dev/urandom
+Read 0xffffffcd 4294967245 -51 from /dev/urandom
+Read 0xffffffd3 4294967251 -45 from /dev/urandom
+Read 0x28 40 40 from /dev/urandom
+Read 0xfffffffb 4294967291 -5 from /dev/urandom
+Read 0xffffff80 4294967168 -128 from /dev/urandom
+Read 0x51 81 81 from /dev/urandom
+Read 0xffffff85 4294967173 -123 from /dev/urandom
+Read 0xfffffff6 4294967286 -10 from /dev/urandom
+Read 0xffffffcc 4294967244 -52 from /dev/urandom
+Read 0x10 16 16 from /dev/urandom
+Read 0xffffffb5 4294967221 -75 from /dev/urandom
+Read 0xffffffa8 4294967208 -88 from /dev/urandom
+Read 0x1c 28 28 from /dev/urandom
+Read 0x21 33 33 from /dev/urandom
+Read 0xffffffe7 4294967271 -25 from /dev/urandom
+Read 0x7d 125 125 from /dev/urandom
+Read 0xffffff9c 4294967196 -100 from /dev/urandom
+Read 0xffffff83 4294967171 -125 from /dev/urandom
+Read 0x45 69 69 from /dev/urandom
+Read 0x14 20 20 from /dev/urandom
+Read 0xffffffd9 4294967257 -39 from /dev/urandom
+Read 0x6 6 6 from /dev/urandom
+Read 0xffffffc6 4294967238 -58 from /dev/urandom
+Read 0x31 49 49 from /dev/urandom
+Read 0xffffffdd 4294967261 -35 from /dev/urandom
+Read 0x39 57 57 from /dev/urandom
+Read 0x15 21 21 from /dev/urandom
+Read 0xffffff8b 4294967179 -117 from /dev/urandom
+Read 0x7d 125 125 from /dev/urandom
+Read 0x6e 110 110 from /dev/urandom
+Read 0xffffff8c 4294967180 -116 from /dev/urandom
+Read 0x1e 30 30 from /dev/urandom
+Read 0x15 21 21 from /dev/urandom
+Read 0x20 32 32 from /dev/urandom
+Read 0x4d 77 77 from /dev/urandom
+Read 0xffffff90 4294967184 -112 from /dev/urandom
+Read 0xffffffe0 4294967264 -32 from /dev/urandom
+Read 0xfffffffb 4294967291 -5 from /dev/urandom
+Read 0xffffffbc 4294967228 -68 from /dev/urandom
+Read 0x54 84 84 from /dev/urandom
+Read 0x39 57 57 from /dev/urandom
+Read 0xffffff9d 4294967197 -99 from /dev/urandom
+Read 0x46 70 70 from /dev/urandom
+Read 0x26 38 38 from /dev/urandom
+Read 0x7e 126 126 from /dev/urandom
+Read 0xffffffa3 4294967203 -93 from /dev/urandom
+Read 0x6f 111 111 from /dev/urandom
+Read 0xffffff9b 4294967195 -101 from /dev/urandom
+Read 0x4b 75 75 from /dev/urandom
+Read 0x4 4 4 from /dev/urandom
+Read 0x4c 76 76 from /dev/urandom
+Read 0x29 41 41 from /dev/urandom
+Read 0xffffffdf 4294967263 -33 from /dev/urandom
+Read 0x48 72 72 from /dev/urandom
+Read 0xffffffea 4294967274 -22 from /dev/urandom
+Read 0x7c 124 124 from /dev/urandom
+Read 0x61 97 97 from /dev/urandom
+Read 0xffffff8d 4294967181 -115 from /dev/urandom
+Read 0xffffff8f 4294967183 -113 from /dev/urandom
+Read 0x27 39 39 from /dev/urandom
+Read 0xffffff85 4294967173 -123 from /dev/urandom
+Read 0x1e 30 30 from /dev/urandom
+Read 0x49 73 73 from /dev/urandom
+Read 0xffffffd8 4294967256 -40 from /dev/urandom
+Read 0xfffffff2 4294967282 -14 from /dev/urandom
+Read 0x4c 76 76 from /dev/urandom
+Read 0xffffffb2 4294967218 -78 from /dev/urandom
+Read 0x62 98 98 from /dev/urandom
+Read 0x26 38 38 from /dev/urandom
+Read 0xffffff87 4294967175 -121 from /dev/urandom
+Read 0x58 88 88 from /dev/urandom
+Read 0xffffffe8 4294967272 -24 from /dev/urandom
+Read 0x59 89 89 from /dev/urandom
+Read 0xa 10 10 from /dev/urandom
+Read 0x62 98 98 from /dev/urandom
+Read 0x71 113 113 from /dev/urandom
+Read 0xffffffb4 4294967220 -76 from /dev/urandom
+Read 0xe 14 14 from /dev/urandom
+Read 0xffffffd3 4294967251 -45 from /dev/urandom
+Read 0x3a 58 58 from /dev/urandom
+Read 0x7e 126 126 from /dev/urandom
+Read 0x79 121 121 from /dev/urandom
+Read 0x77 119 119 from /dev/urandom
+Read 0xffffffbd 4294967229 -67 from /dev/urandom
+Read 0x5e 94 94 from /dev/urandom
+Read 0xffffffc9 4294967241 -55 from /dev/urandom
+Read 0xffffffd0 4294967248 -48 from /dev/urandom
+Read 0xffffffe3 4294967267 -29 from /dev/urandom
+Read 0x7 7 7 from /dev/urandom
+Read 0xffffffdf 4294967263 -33 from /dev/urandom
+Read 0xffffff91 4294967185 -111 from /dev/urandom
+Read 0x62 98 98 from /dev/urandom
+Read 0x57 87 87 from /dev/urandom
+Read 0x3b 59 59 from /dev/urandom
+Read 0x68 104 104 from /dev/urandom
+Read 0x62 98 98 from /dev/urandom
+Read 0xffffff97 4294967191 -105 from /dev/urandom
+Read 0xffffffb1 4294967217 -79 from /dev/urandom
+Read 0x71 113 113 from /dev/urandom
+Read 0x5e 94 94 from /dev/urandom
+Read 0x9 9 9 from /dev/urandom
+Read 0xffffffeb 4294967275 -21 from /dev/urandom
+Read 0x68 104 104 from /dev/urandom
+Read 0x34 52 52 from /dev/urandom
+Read 0xffffffe9 4294967273 -23 from /dev/urandom
+Read 0xffffffc1 4294967233 -63 from /dev/urandom
+Read 0x74 116 116 from /dev/urandom
+Read 0x8 8 8 from /dev/urandom
+Read 0xffffffd3 4294967251 -45 from /dev/urandom
+Read 0xffffffb4 4294967220 -76 from /dev/urandom
+Read 0xffffffd1 4294967249 -47 from /dev/urandom
+Read 0xffffffab 4294967211 -85 from /dev/urandom
+Read 0xffffffde 4294967262 -34 from /dev/urandom
+Read 0xffffff84 4294967172 -124 from /dev/urandom
+Read 0xffffffff 4294967295 -1 from /dev/urandom
+Read 0xffffff83 4294967171 -125 from /dev/urandom
+Read 0xfffffffa 4294967290 -6 from /dev/urandom
+Read 0xffffffe8 4294967272 -24 from /dev/urandom
+Read 0xffffff9f 4294967199 -97 from /dev/urandom
+Read 0xffffffa5 4294967205 -91 from /dev/urandom
+Read 0xfffffff4 4294967284 -12 from /dev/urandom
+Read 0x7a 122 122 from /dev/urandom
+Read 0xffffff8d 4294967181 -115 from /dev/urandom
+Read 0xffffff8b 4294967179 -117 from /dev/urandom
+Read 0x60 96 96 from /dev/urandom
+Read 0xffffffd4 4294967252 -44 from /dev/urandom
+Read 0x7d 125 125 from /dev/urandom
+Read 0xffffffce 4294967246 -50 from /dev/urandom

Assignment 2/exercise1.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+
+void print_memory_layout (char *data, int size );
+
+int main (void)
+{
+	short i = 0x1234;
+	char x = -127;
+	long sn1 = 1489156464;
+	long sn2 = 1541654916;
+	int y[2] = {0x11223344,0x44332211};
+
+	printf("Size in bytes of i: %d\n", sizeof (i));
+	printf("Size in bytes of x: %d\n", sizeof(x));
+	printf("Size in bytes of sn1: %d\n", sizeof(sn1));
+	printf("Size in bytes of sn2: %d\n", sizeof(sn2));
+	printf("Size in bytes of y: %d\n", sizeof(y));
+	
+	// Print memory layout
+	printf( "Address\t\tContent (hex)\tContent(dec)\n");
+	print_memory_layout((char *)&i , sizeof(i));
+	print_memory_layout((char *)&x , sizeof(x));
+	print_memory_layout((char *)&sn1, sizeof(sn1));
+	print_memory_layout((char *)&sn2, sizeof(sn2));
+	print_memory_layout((char *)&sn1, sizeof(y));
+
+}
+
+void print_memory_layout (char *data , int size){
+	for( int i = 0 ; i < size ; i++ ){	
+		printf("0x%08x\t0x%08x\t\%d\n", &data[i], data[i],data[i]);
+	}
+}	

Assignment 2/exercise1.txt

@@ -0,0 +1,33 @@
+Size in bytes of i: 2
+Size in bytes of x: 1
+Size in bytes of sn1: 8
+Size in bytes of sn2: 8
+Size in bytes of y: 8
+Address		Content (hex)	Content(dec)
+0x69caf3ae	0x00000034	52
+0x69caf3af	0x00000012	18
+0x69caf3ad	0xffffff81	-127
+0x69caf3b0	0x00000070	112
+0x69caf3b1	0xffffffb9	-71
+0x69caf3b2	0xffffffc2	-62
+0x69caf3b3	0x00000058	88
+0x69caf3b4	0x00000000	0
+0x69caf3b5	0x00000000	0
+0x69caf3b6	0x00000000	0
+0x69caf3b7	0x00000000	0
+0x69caf3b8	0xffffff84	-124
+0x69caf3b9	0xffffffc9	-55
+0x69caf3ba	0xffffffe3	-29
+0x69caf3bb	0x0000005b	91
+0x69caf3bc	0x00000000	0
+0x69caf3bd	0x00000000	0
+0x69caf3be	0x00000000	0
+0x69caf3bf	0x00000000	0
+0x69caf3b0	0x00000070	112
+0x69caf3b1	0xffffffb9	-71
+0x69caf3b2	0xffffffc2	-62
+0x69caf3b3	0x00000058	88
+0x69caf3b4	0x00000000	0
+0x69caf3b5	0x00000000	0
+0x69caf3b6	0x00000000	0
+0x69caf3b7	0x00000000	0

Assignment 2/exercise2.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+int main (int argc , char **args){
+	// How many bytes does the bool type use?
+	bool test = true;
+	printf("Size of bool in bytes: %d\n", sizeof(test));
+	
+	// Hex of a boolean when its value is set to true
+	printf("Value of bool (State: True): 0x%08x\n", test);
+	
+	// Hex of a boolean when its value is set to false 
+	test = false ;
+	printf("Value of bool (state: False): 0x%08x\n", test);
+
+	test = 255;
+	if(test){
+		printf("Bool with a value of 255 is interpreted as true\n");
+	}
+	else{
+		printf("Bool with a value of 255 is interpreted as false\n");
+	}
+	test = -125;
+	if(test){
+		printf("Bool with a value of -125 is interpreted as true\n");
+	}
+	else{
+		printf("Bool with a value of -125 is interpreted as false\n");
+	}
+	test = 0;
+	if(test){
+		printf("Bool with a value of 0 is interpreted as true\n");
+	}
+	else{
+		printf("Bool with a value of 0 is interpreted as false\n");
+	}
+}

Assignment 2/exercise3.c

@@ -0,0 +1,11 @@
+void addvector(int *r, const int *a, const int *b, unsigned int len)
+{
+  unsigned int i;
+  for(i=0;i<len;i++)
+  {
+    	int *item = (r + i);
+	int a_value = *(a + i);
+	int b_value = *(b + i);
+	(*item)  = a_value + b_value ;
+  }
+}

Assignment 2/exercise3.h

@@ -0,0 +1,2 @@
+void addvector(int *r, const int *a, const int *b, unsigned int len);
+

Assignment 2/main.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include "exercise3.h"
+
+int main(void)
+{
+  int a[10], b[10], r[10];
+  unsigned int i;
+
+  for(i=0;i<10;i++)
+  {
+    a[i] = b[i] = i;
+  }
+
+  addvector(r, a, b, 10);
+
+  for(i=0;i<10;i++)
+  {
+    printf("%d %d %d\n", a[i], b[i], r[i]); 
+  }
+
+  return 0;
+}

Assignment 2/memcmp.c

@@ -0,0 +1,17 @@
+#include<stdlib.h>
+
+// implementation of memcmp 
+
+int memcmp ( void *a, void *b, size_t n){
+	unsigned int i;
+	for ( i = 0; i < n ; i++) {
+		char *a1 = a + i;
+		char *b1 = b + i;
+	
+		char return_value = *a1 - *b1;
+		if( return_value != 0)
+			return (int)return_value;	
+	}
+
+	return 0;
+}

Assignment 2/memcmp.h

@@ -0,0 +1,2 @@
+int memcmp ( void *a, void *b, size_t n);
+

Assignment 2/memcmp_test.c

@@ -0,0 +1,48 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+void print_array(int *array, size_t size);
+
+int main ( int argc , char **argv )
+{
+
+	// Test cases
+	int *test1 = malloc(3 * sizeof(int));
+	int *test1_2 = malloc(3 * sizeof(int));
+	
+	*(test1) = *(test1_2) = 1;
+	*(test1 + 1) = *(test1_2 + 1) = 2;
+	*(test1 + 2) = *(test1_2 + 2) = 3; 
+	
+	int result;
+
+
+	result  = memcmp(test1, test1_2, 0 );	
+
+	printf ("Result should: 0 got %d\n", result);
+
+	result = memcmp(test1, test1_2, 3);
+	
+	printf("Result should: 0 got %d\n", result);
+
+	*(test1 + 2) = 5;  	
+	printf("Array 1:");
+	print_array(test1,  3); 
+	printf("Array 2:");
+	print_array(test1_2, 3);
+
+
+	result = memcmp(test1, test1_2, 3);
+	
+	printf("Result should: 0 got %d\n", result);
+
+	free (test1);
+	free(test1_2);
+}
+
+void print_array(int *array, size_t size){
+	for( int i =0; i < size; i++){
+		printf( "%d\n", *(array+i));
+	}
+}