Program to show Concept of Pointers In C

int c = 10;
int c2 = 20;

/* define a pointer and points to an constant integer.
pc can point to another integer but you cannot change the
content of it */

const int *pc = &c;

/* pc++; */ /* cause error */

printf("value of pc is %d\n",pc);

pc = &c2;

printf("value of pc is %d\n",pc);

/* define a constant pointer and points to an integer.
py only can point to y and its memory address cannot be changed
you can change its content */

int y = 10;
int y2 = 20;

int const *py = &y;

*py++;/* it is ok */
printf("value of y is %d\n",y);

/* py = &y2; */ /* cause error */

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More Useful Topics...


History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming

My 1st Program...

void main ()
clrscr ();
printf ("\n\n\n\n");
printf ("\t\t\t*******Pankaj *******\n");
printf ("\t\t\t********************************\n");
printf ("\t\t\t\"Life is Good...\"\n");
printf ("\t\t\t********************************");
getch ();

Next Step...


void main ()
clrscr ();
printf ("\n\n\n\n\n\n\n\n");
printf ("\t\t\t --------------------------- \n\n");

printf ("\t\t\t | IGCT, Info Computers, INDIA | \n\n");
printf ("\t\t\t --------------------------- ");

getch ();