C Program to print Product of Digits of a given number

/*
eg. 212=2*1*2=4
eg. 313=3*1*3=9
*/

#include<stdio.h>

#include<conio.h>

void main()

{

 int no,r,pt=1;

 clrscr();

 printf("Enter a no:");

 scanf("%d",&no);

 while(no>0)

 {

  r=no%10;

  pt=pt*r;

  no=no/10;

 }

 printf("Product of Digits= %d",pt);

 getch();

}

C program to sort 10 Array elements in descending order Using Array

# include<stdio.h>
# include<conio.h>
void main()
{
int arr[10];
int i,j,temp;
clrscr();
for(i=0;i<10;i++)
scanf("%d",&arr[i]);
for(i=0;i<9;i++)
{
  for(j=i+1;j<10;j++)
  {
   if(arr[i]<arr[j])
   {
   temp=arr[i];
   arr[i]=arr[j];
   arr[j]=temp;
   }
}
}
printf("\nSorted array elements :\n");
for(i=0;i<10;i++)
printf("%d ",arr[i]) ;
getch();
}

C Program to Reverse print an array

# include<stdio.h>
# include<conio.h>

void main()
{
int arr[10];
int i,j,temp;
clrscr();
for(i=0;i<10;i++)
scanf("%d",&arr[i]);
printf("\nPrinting an sorted array\n");
for(i=9;i>=0;i--)
printf("%d ",arr[i]) ;
getch();
}

C Program to Print Alternate Using Array

# include<stdio.h>
# include<conio.h>
void main()
{
 int arr[10];
 int i,j,temp;
 clrscr();
 for(i=0;i<10;i++)
 scanf("%d",&arr[i]);
 for(i=0;i<10;i+=2)
 printf("%d ",arr[i]) ;
 getch();
}

C Program print alternate element of an array

 /*C Program to print alternate element of an array*/
# include<stdio.h>
# include<conio.h>

void main()
{
int arr[10];
int i,j,temp;
clrscr();
for(i=0;i<10;i++)
scanf("%d",&arr[i]);
for(i=0;i<10;i+=2)
printf("%d ",arr[i]) ;
getch();
}

C Program Accept 10 numbers and no. to search, print its occurrence Using Array

/* Accept 10 numbers and no. to search, print its occurence
 Write a program to accept 10 no’s  and a number to search and print how many times it occurs in array */

# include<stdio.h>
# include<conio.h>

void main()
{
 int arr[10];
 int i,cnt=0,tosearch;
 clrscr();
 /* accepting an array*/
 for(i=0;i<10;i++)
  {
   printf("\n Enter %d number-",i);
   scanf("%d",&arr[i]);
   }
 printf("\nEnter a number to be search-");
 scanf("%d",&tosearch);
 for(i=0;i<10;i++)
 {
  if(arr[i]==tosearch)
    cnt++;
 }
 printf("\n Number occurs %d times",cnt);
 getch();
}

Friend Function Using C++

#include<iostream.h>

class Sample

{

int a;

int b;

public:

void setvalue()

{

a=25;

b=40;

}

friend int avg(Sample s);

};

int avg(Sample s)

{

return(s.a+s.b)/2;

}

Void main()

{

Sample x;

x.setvalue();

cout<<avg(x);

}

************************************

Friend function

With the use of a friend function we can access the private data of a class.

class Abc

{

….

….

public:

….

friend void xyz();/declaration

};

Characteristics of friend function

>It is not in the scope of the class to which it has been declared 

>Since it is not in the scope of the class,it cannot be called using the object of that class

>It can be invoked like a normal function without the help of any object

>But we cannot access the member names directly & has to use an object name & dot operator

 (e.g. A.x)

>Usually it has the objects as arguments