Jack Rosen, Assignment 7

assignment7.txt

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+Jack Rosen
+1. ++*p increments the value at point p. *p++ increments p and then returns the value. *++p increments p and then returns the value as well.
+2. It is only guaranteed for certain operators. The first level of operators goes from left to right, the second goes from right to left, and the rest go from left to right.
+3.The advantages of using pointers is that they are very powerful and help a person work with arrays. It is also a way to access a variable without having to call for it.
+4.1 char *
+4.2 invalid
+4.3 invalid
+4.4 10
+4.5 0
+4.6 12
+4.7 2
+4.8 char
+4.9 0
+4.10 6

reverse.c

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+#include <stdio.h>
+#include <string.h>
+
+void stringReversal(char *input)
+{
+	 char *ptrBegin = input, *ptrEnd = ptrBegin + strlen(input) - 1;
+         for (; ptrBegin <=  ptrEnd; --ptrEnd)
+         {
+		 if (*ptrEnd == '\n')
+		 {
+		 	continue;
+		 }
+		 printf("%c", *ptrEnd);
+
+	}
+
+}
+
+int main()
+{
+	printf("Write anything you want!\n");
+	char input[1000] = {};
+	int i;
+	fgets(input, sizeof(input),  stdin);
+	for (i = 0; i < strlen(input); i++)
+	{
+		if (input[i] == '\n' || input[i] == '\0')
+		{
+			i--;
+			break;
+		}
+	}
+	stringReversal(input);
+	printf("\n");
+	return 0;
+}

string.c

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+#include <stdio.h>
+#include <string.h>
+void concat(char *ptr1, char *ptr2)
+{
+	char *ptr3 = ptr1;
+	while (*ptr3 != '\0')
+	{
+		ptr3++;
+	}
+	while (*ptr2 != '\0')
+	{
+	 	*ptr3 = *ptr2;
+	 	ptr3++;
+	 	ptr2++;
+	}
+	ptr3++;
+	*ptr3 = '\0';
+}
+int compare(char *ptr1, char *ptr2)
+{
+	int flag=0;
+
+	while(*ptr1!='\0' && *ptr2!='\0'){
+		if(*ptr1 != *ptr2){
+			flag=1;
+			break;
+		}
+		ptr1++;
+		ptr2++;
+	}
+        if (flag==0 && *ptr1=='\0' && *ptr2=='\0')
+	{
+		return 0;
+	}
+	else if (*ptr1 > *ptr2)
+	{
+		return 1;
+	}
+	else if (*ptr2 > *ptr1)
+	{
+		return -1;
+	}
+
+}
+int main()
+{
+	char ptr1[12] = "Hello ", ptr2[] = "World";
+	concat(ptr1, ptr2);
+	printf("%d\n", compare(ptr1,ptr2));
+	printf("%s\n", ptr1);
+	return 0;
+}