Assignment 7

assignment7.txt

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+Olivier Gabison
+
+1. ++*p dereferences the value that the p variable is pointing to and then increments it. While *p++ increments the pointer,
+and then dereferences it. Finally, *++p first increments the pointer and then dereferences it.
+
+2. No, order of precedence is not done through left to right order.
+
+3. I think the best uses of pointers is passing by reference and dynamic starting sizes on arrays.
+
+4.1  char *, its a string, and char[] has '\0' at the end of it.
+4.3 1 - the ASCII value of '\0' is 0. Therefore, 0 = 0, which returns 1;
+4.4 int, dereference of pointer a
+4.5 int *, it creates a pointer that is used upon a[0]
+4.6 int, dereference of pointer p
+4.7 int **, creates a pointer for pointer p
+4.8 char *, derefernce of the double pointer 'argv'
+4.9 This does not work as you cannot cast a pointer to a function
+4.10 5 (only when string.h is included)

reverse.c

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+#include <stdio.h>
+
+int main(){
+
+  char word[100] = "HELLOHH"; //THIS IS THE WORD THAT WILL BE REVERSED
+  char *Start = word - 1;
+  char *End = Start + strlen(word);
+  int i;
+  for (i=0; *Start!=*End; i++) {
+  	printf("%c",*End);
+  	End--;
+  }
+  printf("\n");
+
+
+
+  return 0;
+}

stringf.c

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+#include <stdio.h>
+
+int strcmp(char *a, char *b){
+  if(*a > *b){
+    return 1;
+  } else {
+    if (*a < *b){
+      return -1;
+    } else {
+      a++;
+      b++;
+      return strcmp(a, b);
+    }
+  }
+}
+
+char *strcat(char *a, char *b){
+  char *answer[100];
+  int i;
+
+  for(i = 0; i < 100; i++){
+    if(*a == '\0'){
+      break;
+    }
+    answer[i] = *a;
+    a++;
+  }
+
+  for (int j = i; i < 100; j++){
+    if(*b == '\0'){
+      break;
+    }
+    answer[j] = *b;
+    b++;
+  }
+
+  return answer;
+}
+
+int main(){
+
+  char s1[] = "Hello";
+  char s2[] = "Hallo";
+
+  printf("%s", strcat(s1,s2));
+
+  return 0;
+}