Question

What is the output of the following. Explain why this output was obtained.
int k[3] = { 10, 20, 30 };
int *kp;
kp = k;
printf("%d\n", *kp + 2);
printf("%d\n", *(kp + 2));

Find the output of the following:
double z = 56.4;
double *p;
p = &z;
printf("%lf\n", *p / 2);

Suppose the following array has already been declared. Declare a pointer to this array and then use the pointer in a loop to multiply each array value by 2.
int ar[] = { 28, 95, -45, 67, -61 };

Answer 1

int k[3] = { 10, 20, 30 };
int *kp;
kp = k;
printf("%d\n", *kp + 2);
printf("%d\n", *(kp + 2));

Output:-

12

30

Explanation:-

IN the first printf statement , *kp is pointing to the initial value of the array i.e. 10 so *kp will hold the value 10 and adding 2 will result in 12.

In the next printf statement , kp is holding the address of first element of array adding 2 will point to the 3rd element of array so *(kp+2) will give 30

=================================================================

double z = 56.4;
double *p;
p = &z;
printf("%lf\n", *p / 2);​​​​​​​

Output:-

28.200000

Explanation:-

p is storing the address of z , so *p will hold the value of z i.e. 56.4 . so dividing by 2 will result in 28.2

=================================================================

Please Refer to the code below:-

#include <stdio.h>

int main()
{
// Declaring std::array<T, N> ;
int ar[] = { 28, 95, -45, 67, -61 };
// Declaring pointer and loop variable
int *kp,i;
// Finding size of array
int n = sizeof(ar)/sizeof(ar[0]);
// initializing pointer
kp =ar;
// multiplying array by 2 using pointer
for(i=0;i<n;i++)
{
ar[i]=*(kp+i)*2;
}
// printing array
for(i=0;i<n;i++)
{
printf("%d\n", ar[i]);
}

return 0;
}

Output:-

56                                                                                  

190                                                                                 

-90                                                                                 

134                                                                                 

-122    

Please Refer to the images below:-

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