Matthew Danielson - Assignment 7

Part2

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+Matthew Danielson
+7/7/16
+Part 2 of Assignment7
+
+1) ++*p increments the value of a pointer, and *p++ increments the address of a pointer. *++p is not valid, as it is incrementing invalidly.
+
+2) Left to right order is guaranteed for operator precedence; without this, many operators become essentially useless, because the logic of the code would not be reliable.
+
+3) Pointers are passed by reference allowing for multiple return types. Additionally, constant pointers can be made; additionally, arrays of pointers allow for non-standard char arrays that are of varying size. They can also be used to return an array of values.
+
+4) a[0] = 11
+a[1] = 11
+a[2] = 12
+a[3] = 13
+a[4] = 14
+a[5] = 15
+a[6] = 16
+a[7] = 17
+a[8] = 18
+a[9] = 19
+p = 12
+char *varname[]
+4.1 char[]
+4.2 would subtract ascii values, resulting in value 1, or SOH
+4.3 Valid, changes a char
+4.4 Pointer
+4.5 Returns the address of the beginning of the array
+4.6 Returns the value that said pointer points to
+4.7 Returns the address of a pointer
+4.8 Increments the address of the pointer
+4.9 Gets the address of the variable
+4.10 Returns an integer length of the space in memory
+
+

exercise.c

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+/* Matthew Danielson
+*  7/8/16
+*  Pointers Practice
+*  name: exercise.c
+*/
+#include <stdio.h>
+
+int strcmp(char[], char[]);
+void  strct(char[], char[]);
+
+int main(){
+	char *s1 = {"Hey"};
+	char *s2 = {"all"};
+	strct(s1,s2);
+	return 0;
+}
+
+int strcmp(char array1[4], char array2[4]){
+	int toreturn = 0;
+	for(int x = 0; x< 20; x++){
+		if(array1[x] != array2[x]){
+			if(array1[x] > array2[x])
+				toreturn = -1;
+			if(array1[x] < array2[x])
+				toreturn = 1;
+			break;
+		}
+	return toreturn;
+	}
+}
+
+void strct(char array1[4], char array2[4]){
+	char array3[sizeof(array1) + sizeof(array2)-2];
+	int x = 0;
+	printf("%d\n", (int)sizeof(array1));
+	for(; array1[x] != '\0';x++){
+		array3[x] = array1[x];
+	}
+	for(int y = 0;y<sizeof(array2); x++){
+		array3[x] = array2[y];
+		y++;
+	}
+	printf("%s\n", array3);
+
+
+
+
+}

reverse.c

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+/* Matthew Danielson
+*  7/7/16
+*  reverse.c
+*  Takes a string and prints it in reverse
+*/
+
+#include <stdio.h>
+
+int main(){
+	int length;
+	char throwaway;
+	printf("How long will your string be?");
+	scanf("%d", &length);
+	length ++;
+	scanf("%c", &throwaway);
+	char array[length];
+	printf("\nPlease enter a string:");
+	fgets(array, sizeof(array), stdin);
+	char *start = array;
+	char *end = array + sizeof(array) + 1;
+	while(*start != *end){
+		printf("%c", *end);
+		*end--;
+	}
+	printf("\n");
+
+}