Question

this program is to be done in c language. Using Pointers Create a program pointerTester.c to experiment with pointers. Implement the following steps one by one in your program: YOU NEED TO ANSWER QUESTION Use printf to print your answers at the end(after 12). 1. Declare three integer variables a, b and c. Initialize them to 0, 100 and 225, respectively. 2. Print the value of each variable and its address. 3. Add the following declaration to your code: int *pA = &a, *pB = &b, *p; 4. Print the value of each pointer and the value it points to (using the pointer) 5. Run your program multiple times. a. Does any of the values *pA, *pB or *p change? b. Does any of the values pA, pB or p change? 6. Change the value that p points to to 50 without declaring the valuable that p points to. Can you print the value that p points to? 7. Declare an array z of 10 integers and initialize its elements to 0, 1, 2, …., 9 8. Print the address of each element in the array using the z[i] notation 9. Print the address of each element in the array using the z + i notation 10. Print the content of the array using z + i notation 11. Declare a string literal x and set it to value “hello”. 12. Change the second character of x to upper case. What happens? Strings Write a program reading.c that reads from standard input according to the user’s choice. The program should ask “How would you like to read?” 1: character by character; 2: word by word; 3: line by line. Default: print “Invalid choice”. You should write the three procedures below. - The procedure readCharByChar asks the user to enter 5 characters and read them (hint: using %c). - The procedure readWordByWord asks the user to enter 5 words and read them (hint: using %s). - The procedure readLineByLine should ask the user to enter 5 lines and read them (hint: using gets). In each of the three procedures, the values read should be printed to the screen, each on a separate line showing: input index, tab, unit (char, word, or line). According to the user choice, your program uses a switch statement to call readCharByChar, readWordByWord, and readLineByLine, respectively. Make sure your code is properly indented, your variables have meaningful names, and macro definitions are used when appropriate.

Answer 1

Refer to the given problem.

Consider the following c language program.

C program:

#include <stdio.h>
int main()
{
// 1. Declaring a, b and c ( integer variables). Now initializing the integer to 0, 100 and 225, respectively.
int a,b,c;
a = 0;
b = 100;
c = 225;

// 2. Printing each variable value a,b and c and its address
printf("Variable a = %d and addrress is %u\n", a,&a);
printf("Variable b = %d and addrress is %u\n", b,&b);
printf("Variable c = %d and addrress is %u\n", c,&c);

// 3. Adding declaration to the code:
//int *pA = &a, *pB = &b, *p;
int *pA = &a, *pB = &b, *p;

// 4. Printing each pointer value which it points to (via pointer)
printf("Value of pointer pA = %u and value it points to %d\n", pA, *pA);
printf("Value of pointer pB = %u and value it points to %d\n", pB, *pB);
printf("Value of pointer p = %u and value it points to nothing\n", p);
// The value and address of For pA and pB gets printed but for pointer p, nothing points thus it’s a null pointer
//printf("Value of pointer p = %u and value 1it points to %d\n", p, *p) // will not work and error is fault segmentation;

// 5. Start running the program for multiple times.
// 5.a. Check if any of the values *pA, *pB or *p alter?
// >>>> By running program multiple times *pA *pB does not changes
// 5.b. check if any of the values pA, pB or p alter?
// >>>> By running program multiple times pA pB changes but p remains to 0

// 6. Update the value of p.
*p = 50;//Print the value of p.
printf("Value of pointer p = %u and value it points to %d\n\n", p, *p);

// 7. Declare an array
int z[10];//Initialize the aaray
for(int i = 0 ; i < 10 ; i++)
{
z[10] = i;}

// 8. Iterate through the array and print the value.
for(int i = 0 ; i < 10 ; i++)
{
printf("value of z[%d] = %d\n",i ,i);
z[10] = i;}

// 9. Iterate through the array and print the address.
for(int i = 0 ; i < 10 ; i++)
{
printf("address of z[%d] = %u\n",i ,z+i);
z[10] = i;
}

// 10. Iterate through the array and print using z + i notation
for(int i = 0 ; i < 10 ; i++)
{
printf("content of z + %d = %d\n",i ,*(z+i));
z[10] = i;}

// 11. Define the string variable.
char *x = "hello";

// 12 . Update the variable change 2nd index to uppercase.
printf("%c", *(++x)-32);return 0;}

Consider the following Output:

Output:

Hope it helps!