C&C++

/*Hello World in C */

#include<stdio.h>         /* it is Standard I/O Library header file */

#include<conio.h>       /* it is Console I/O Library header file */

main()
{
    clrscr();  /* To Clear the previous output*/

    printf("Hello, World");       /* To print the text (Output)*/

    getch();  /* To get a character  ,used to wait output until press any key */

}

---

//Hello World in C+ +

#include<iostream.h>

#include<conio.h>

int main()
{
    clrscr(); //To Clear the previous output

  cout<<"Hello, World";      //It's like printf() in  'C' (Output)

   return 0;
   getch();
}

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Swapping Logic:
I)

c=a                                    
a=b                    

b=c  

II)

a=a+b
b=a-b
a=a-b

ex: Before Swapping a=4,b=5
     Logic:a=4+5=9
              b=9-5=4
              a=9-4=5        
    After Swapping a=5,b=4

III)
a=a*b
b=a/b
a=a/b


ex: Before Swapping a=4,b=5
     Logic:a=4*5=20
              b=20/5=4
              a=20/4=5      
    After Swapping a=5,b=4

IV)

a=a^b
b=a^b
a=a^b


ex: Before Swapping a=4,b=5
     Logic:a=(0010)^(0101)=0111=7
              b=(0111)^(0101)=0010=4
              a=(0111)^(0010)=0101=5    
    After Swapping a=5,b=4

V)

a=a+b-(b=a)

ex: Before Swapping a=4,b=5
     Logic:a=(4+5)-(4)
                =9-4=5          
               After Swapping a=5,b=4

---

/* To print welcome without Semicolon */

#include<stdio.h>

#include<conio.h>

main()
{

      if(printf("Hello"))
     {
     }
getch();
}

---

/*Sum of Digits in Single Statement */

#include<stdio.h>

#include<conio.h>

main()
{
    int n,sum=0;

    clrscr();   /* To Clear the previous output*/

    printf("Enter Any Number"); /* To print the text */
    scanf("%d",&n);  /* To store the 'n' value from user (input)*/
 
   sum=n%9; /* Simple logic for sum of digits */

   if(sum==0){ /*check the condition */
         printf("Sum of  Digits of %d is:9",n);
  }
  else {
          printf("Sum of Digits of %d is :%d ",n,sum);
 }
 getch();  /* To get a character  ,used to wait output until press any key */
}

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