Create a program pointerTester.c to experiment with pointers. Implement the foll

Question

Create a program pointerTester.c to experiment with pointers. Implement the following steps: Declare three integer variables a, b and c. Initialize them to 0,100 and 225 Print the value of each variable and its address. Add the following declaration to your code: int *pA = &a;, *pB = &b;, *p; Print the value of each pointer and the value it points to. What is the value of (*p)? Print the value of each pointer and the value it points to using the "%p" specifier. Run your program multiple times. Does any of the values *pA, *pB or *p change? Does a the values pA, pB or p change? Change the value that p points to to 50. Set p to point to a; Find 3 different ways to change the value of a to 92; Add the following to your code: p = pA; *p = 22; p = pB; *p = 18; p = &b; *p = 108; p = pA; *p = 2; *p = &a; What is the effect of the previous statements? Verify by printing the values of p, pA, pB, *pA, *pB, a, b, &a;, &b; after every step. Declare an array z of 10 integers and initialize its elements to 0, 1, 2,.... Print the address of each element in the array Print the values of z, (z+1), (z+2),...., (z+12). Add the following: *(z+3)++. What does this statement do? Add the following: int * t = z; Print t, t+1, t+2, t+3, t+4. Set t to t+5. Print t, *t.

Explanation / Answer

Solution:

Here is the solution to first 6 parts:

1)

int a=0,b=100,c=225;

2)

printf("%d,%d",a,&a);
printf(" ");
printf("%d,%d",b,&b);
printf(" ");
printf("%d,%d",c,&c);
printf(" ");

Output of 2:

0,10485300
100,10485296
225,10485292

3)

int *pA=&a,*pB=&b,*p;

4)

printf("%d,%d",pA,*pA);
printf(" ");
printf("%d,%d",pB,*pB);
printf(" ");
printf("%d,%d",p,*p);

The *p is initially unitialized, so its giving error.

Output:

10485300,0
10485296,100

5)

printf("%p,%p",pA,*pA);
printf(" ");
printf("%p,%p",pB,*pB);
printf(" ");
printf("%p,%p",p,*p); //Giving error as unitialized
printf(" ");

Output:

00000000009FFE34,0000000000000000
00000000009FFE30,0000000000000064

6) On running multiple times, the value of all pointer variables remained same.

Program to be copied:

#include <stdio.h>

int main()
{
int a=0,b=100,c=225;

printf("%d,%d",a,&a);
printf(" ");
printf("%d,%d",b,&b);
printf(" ");
printf("%d,%d",c,&c);
printf(" ");

int *pA=&a,*pB=&b,*p;
printf("%d,%d",pA,*pA);
printf(" ");
printf("%d,%d",pB,*pB);
printf(" ");
//printf("%d,%d",p,*p); //Error is coming so commented
printf(" ");
printf("%p,%p",pA,*pA);
printf(" ");
printf("%p,%p",pB,*pB);
printf(" ");
//printf("%p,%p",p,*p); //Error is coming so commented
printf(" ");

return 0;

}

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