NIELIT 2017 July Scientist B (IT) - Section B: 35

Question

Assume that float takes $4$ bytes, predict the output of following program.

#include<stdio.h>
int main() 
{ 
float arr[5]={12.5,10.0,13.5,90.5,0.5}; 
float *ptr1=&arr[0]; 
float *ptr2=ptr1+3; 
printf("%f",*ptr2); 
printf("%d",ptr2-ptr1); 
return 0; 
} 

• A. $90.500000\:\:3$
• B. $90.500000\:\:12$
• C. $10.000000\:\:12$
• D. $0.500000\:\:3$

Comments

A is Answer...

Answer 1

float arr[5]={12.5,10.0,13.5,90.5,0.5};
float *ptr1=&arr[0]; // point to first element of arr
float *ptr2=ptr1+3; // point to fourth element of arr
printf("%f",*ptr2); // prints 90.500000
printf("%d",ptr2-ptr1); // pointer substraction is scaled to base type, gives number of elements between the two. prints 3

So A is correct.

 

Comments

Good explain

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no of elements is 2 between p1 and p2. how can the count be 3, is p1 also counted?

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have you got the asnwer?Please explain how the count comes 3