Pointers in C++

#include<iostream.h>

#include<conio.h>

void main()

{

int i,*iptr;

iptr=&i;

i=20;

clrscr();

cout<<”I value is:”<<i<<endl;

*iptr=*iptr+30;

cout<<”I value is:”<<i<<endl;

getch();

}

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

#include<iostream.h>

#include<conio.h>

void main()

{

int arr[5]={10,20,30,40,50};

int *ptr,i;

clrscr();

ptr=arr;

for(i=0;i<5;i++)

{

cout<<*(ptr+i)<<”\t”;

*(ptr+i)=*(ptr+i)+5;

}

cout<<endl;

for(i=0;i<5;i++)

cout<<arr[i]<<endl;

getch();

}

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

#include<iostream.h>

#include<conio.h>

void main()

{

char name[10];

char *cptr;

clrscr();

cout<<”Enter the name in lower case:”;

cin>>name;

for(;*cptr!=’\0’;*cptr++)

{

if(*cptr>=’a’ && *cptr<=’z’)

*cptr=*cptr-32;

}

cout<<”Upper case is:”<<name<<endl;

getch();

}