Program to access an array using a pointer

#include<stdio.h>

main()

{        

          int a[]={10,20,30,40,50};

          int i,* j;

           j=a;

           clrscr();

          for(i=0;i<5;++i)

          {

                   printf("\nElement no. is %d and address is                                 %u",*j,j);

                   j++;

          }

}

Program to demonstrate use of pointer to pointer

#include<stdio.h>

#include<conio.h>

main()

{

          int a=5,*b,**c;

          clrscr();

          b=&a;

          c=&b;

          printf("address of a= %d\n",a);

          printf("address of a= %d\n",*b);

          printf("adrress of a= %d\n",**c);

          printf("adrress of b= %u\n",b);

          printf("adrress of b= %u\n",c);

          printf("address of c= %u\n",&c);

}

Program to demonstrate use of union

#include<stdio.h>

main()

{

          union a

          {

                 short int i;

                   char ch[2];

          };

          union a key;

          key.i=512;

          clrscr();

          printf("key.i=%d\n",key.i);

          printf("key.ch[0]=%d\n",key.ch[0]);

          printf("key.ch[1]=%d\n",key.ch[1]);

          return 0;

}

Program showing Whether given String Is Palindrome Or Not

#include<stdio.h>

#include<string.h>

main()

{

          char  s1[20],s2[20];

          clrscr();

          printf("Enter a string");

          gets(s1);

          strcpy(s2,s1);

          strrev(s2);

          if((strcmp(s1,s2))==0)

                   printf("String is a palindrome");

          else

                   printf("String is not a palindrome");

}

Simple 'C' language programming

The C programming language is a structure oriented programming language, developed at Bell Laboratories in 1972 by Dennis Ritchie. C programming language features were derived from an earlier language called “B” (Basic Combined Programming Language – BCPL). C language was invented for implementing UNIX operating system. In 1978, Dennis Ritchie and Brian Kernighan published the first edition “The C Programming Language” and commonly known as K&R C. In 1983, the American National Standards Institute (ANSI) established a committee to provide a modern, comprehensive definition of C. The resulting definition, the ANSI standard, or “ANSI C”, was completed late 1988.