Pointers

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>  

int main() {     

  int arr[]={0,1,2,3,4};

  int i,*p;

  for(p=&arr[4];p>=&arr[0];p--)

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

  return 0; 

} 

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>

void main(){

  int arr[]={10,20,30,40,50};

  int i, *k;

  k = &arr[4]-4;  

  for(i=0; i<=4; i++){

    printf("%d,",*k);

    k++;

  }

}

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>  

int main() {     

  int arr[]={0,1,2,3,4};

  int i,*p;

  for(p=&arr[4];p>=&arr[0];p--)

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

  return 0; 

} 

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>

void main(){

  int arr[]={10,20,30,40,50};

  int i, *k;

  k = &arr[4]-4;  

  for(i=0; i<=4; i++){

    printf("%d,",*k);

    k++;

  }

}

Practice Pointers –

What will be the output of the program on GCC compiler?

#include<stdio.h>  

int main() {     

  printf("%d, %d
", sizeof(NULL), sizeof(""));    

  return 0; 

} 

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>  

int main() {    

  int x=30, *y, *z;     

  y = &x; /* Assume address of x is 500 */    

  z = y;  

  *y= *z;  

  x++;    

  printf("x=%d, y=%u, z=%u
", x, *y, z);

  return 0;

}

Practice Pointers –

What will be the output of the program on a 64 bit GCC compiler?

#include<stdio.h> 

int main() {     

  float *p;

  int *q;     

  printf("%d %d
", sizeof(p), sizeof(q));     

  return 0; 

} 

Practice Pointers –

What will be the output of the following program on GCC?

#include <stdio.h>

#include <malloc.h>

int main(){

  struct node{

    struct node *pre;

    struct node *next;

    int i;    

  };

  struct node *p,*q;

  p=(struct node *) malloc(sizeof (struct node));

  q=(struct node *) malloc(sizeof (struct node));

  p->i=75;

  q->i=90;



  p->pre=NULL;

  p->next=q;

  q->pre=p;

  q->next=NULL;

  while(p!=NULL){

    printf("%d
", p->i);

    p=p->next;

  }

  return 0;

}

Practice Pointers –

What will be the output of the following program on GCC?

#include <stdio.h>

#include <malloc.h>

#define NULL 0

int main(){

  struct node{

    int data;

    struct node *link;

  };

  struct node *p,*q;

  p=(struct node *) malloc(sizeof (struct node));

  q=(struct node *) malloc(sizeof (struct node));

  p->data=30;

  p->link=q;

  q->data=40;

  q->link=NULL;

  printf("%d
",p->data);

  p=p->link;

  printf("%d
",p->data);

  return 0;

}

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>  

int main() {     

  char str1[] = "Logic";     

  char str2[] = "Try";     

  char *s1 = str1, *s2=str2;

  while(*s1++ = *s2++){   

    printf("%s", str1);     

  }   

  return 0;

}

Practice Pointers –

What will be the output of the following program on GCC compiler ?

#include<stdio.h>  

int main() {     

  char str[] = "peace";     

  char *s = str;     

  printf("%s
", s++ +3);     

  return 0; 

} 

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include<stdio.h> 

void fun(int **p);  

int main() {     

  int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 8, 7, 8, 9, 0};     

  int *ptr;     

  ptr = &a[0][0];     

  fun(&ptr);     

  return 0; 

} 

void fun(int **p) {     

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

} 

Practice Pointers –

What will be the output of the program assuming that the array begins at the location 1000 on GCC compiler?

#include <stdio.h>    

int main()  {      

  int a[3][4] = { 1, 2, 3, 4,  5, 6, 7, 8,  9, 10, 11, 12 };

  printf("%u, %d, %d
", a[0]+1, *(a[0]+1), *(*(a+0)+1));      

  return 0; 

}  

Practice Pointers –

What will be the output of the following program on GCC compiler?

#include <stdio.h>  

int main() {     

  char str1[] = "Logic";     

  char str2[] = "Try";     

  char *s1 = str1, *s2=str2;

  while(*s1++ = *s2++){   

    printf("%s", str1);     

  }   

  return 0;

}

Practice Pointers –

What will be the output of the following program on GCC compiler ?

#include<stdio.h>  

int main() {     

  char str[] = "peace";     

  char *s = str;     

  printf("%s
", s++ +3);     

  return 0; 

}