Matrix ( Diagonal Sum )

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#include<iostream.h>

#include<conio.h>

void main()

{

int i,j,sum=0,a[3][3];

cout<<"\nEnter the Matrix of 3-3 size:\n";

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

cin>>a[i][j];

}

}

for(i=0;i<3;i++)

 {

 for(j=0;j<3;j++)

  {

  cout<<" "<<a[i][j];

  }

 cout<<"\n";

 }

for(i=0;i<3;i++)

{

 for(j=0;j<3;j++)

  {

   if(i==j)

   {

   sum=sum+a[i][j];

   }

  }

}

cout<<"\n Sum is:"<<sum;

getch();

}

Fibonacci Series

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#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int i,second=1,first=0,third;

cout<<"\nFIBINACOO SERIES:";

cout<<"\n"<<first;

cout<<"\n"<<second;

for(i=3;i<10;i++)

{

third=first+second;

cout<<third;

first=second;

second=third;

}

getch();

}

Prime or Composite number

The coding starts from next line:-

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#include<iostream.h>

#include<conio.h>

#include<math.h>

#include<dos.h>

void main()

{

clrscr();

int i,num,ans;

cout<<"\nEnter the number you want to check:";

cin>>num;

for(i=2;i<=(num-1);i++)          //(i=2;i<=num/2;i++)

{

if(num%2==0)

{

ans=1;

break;

}

else

{

ans=0;

}

}

if(ans==1)

{

cout<<"\It is a composite number";

}

else {

cout<<"\nits a prime number";

}

getch();

}

Replacing space by a character " * "

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#include<iostream.h>

#include<conio.h>

#include<stdio.h>

#include<string.h>

void main()

{

clrscr();

char ch,name[20];

int i,l;

cout<<"\nEnter a String:";

gets(name);

l=strlen(name);

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

{

if(name[i]==' ')

{

name[i]='*';

}

}

cout<<"\n "<<name;

getch();

}

Bubble Sort ( Ascending & Descending )

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#include<iostream.h>

#include<conio.h>

void main()

{

    int i, j, size, name[20], temp;

    cout<<"\nHow many numbers:";

    cin>>size;

    cout<<"\nEnter the 1 d arrays:";

    

    for(i = 0; i < size; i++)

    {

        cin>>name[i];

    }

    for(i = 0; i < size; i++)

    {

        for(j = 0; j < size-i-1; j++)

        {

            if(name[j] > name[j+1])   //just replace > by < for descending order. 

            {

                temp = name[j];

                name[j] = name[j+1];

                name[j+1] = temp;

            }

        }

    }

    cout<<"\nAccending order is:";

    for(i = 0; i < size; i++)

    {

        cout<<" "<<name[i];

    }

    getch();

}

Call by Reference

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#include<iostream.h>

#include<conio.h>

void swap(int &a,int &b);

void main()

{

clrscr();

int a,b;

cout<<"\nEnter the value of a:";

cin>>a;

cout<<"\nEnter the value of b:";

cin>>b;

swap(a,b);

cout<<"\nReplace value of a:"<<a;

cout<<"\nReplace dvalue of b:"<<b;

getch();

}

void swap(int &a,int &b)                                                                       // Function starts here

{

int c;

c=a;                                                                                                     //Swapping code

a=b;

b=c;

}