Practice session (Program)

(1)
Program to add two numbers
#include<iostream.h>
#include<conio.h>
void main()
{
int a,b,sum;
cout<<”Enter two numbers”;
cin>>a>>b;
sum=a+b;
cout<<”The  sum is”<<sum;
getch();
}

(2)
Program to Convert a Decimal number upto 100 digits into Binary number
#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdio.h>


void main()
{
clrscr();
char dec[101],bin[101];
int n,q,rem,t,j,k=0;
cout<<"Enter Decimal number upto 100 digits";
gets(dec);
while(dec[0]!='\0')
{
    rem=0;j=0;
    for(int i=0;dec[i]!='\0';i++)
        {
            t=dec[i]-48;
            n=rem*10+t;
            q=n/2;
            rem=n%2;
            dec[j]=q+48;
            j++;
            if(dec[0]=='0')
                j=0;

        }
        dec[j]='\0';
        bin[k]=rem+48;
        k++;
}
bin[k]='\0';
strrev(bin);
cout<<"The binary Number is";
puts(bin);
getch();
}

(3)
Function Overloading Example
#include<iostream.h>
#include<conio.h>
#include<math.h>



void area(int a)
{
    cout<<"Area of Square"<<a*a;
}
void area(int l,int b)
{
    cout<<"Area of rectangle"<<l*b;
}
void area(int a,int b,int c)
{
    float s,ar;
    s=(a+b+c)/2.0;
    ar=sqrt(s*(s-a)*(s-b)*(s-c));
    cout<<"Area of triangle"<<ar;
}
void main()
{
int op,a,b,c;
cout<<"1.Area of Square";
cout<<"\n2.Area of Rectangle";
cout<<"\n3.Area of Triangle";
cout<<"\nEnter your option";
cin>>op;
switch(op)
    {
    case 1:
            cout<<"Enter Side";
            cin>>a;
            area(a);
            break;
    case 2:
            cout<<"Enter length and breadth";
            cin>>a>>b;
            area(a,b);
            break;
    case 3:
            cout<<"Enter Sides of a triangle";
            cin>>a>>b>>c;
            area(a,b,c);
            break;
    default:
            cout<<"Invalid Option";
    }
getch();
}

(4)
Program to add 10 integer numbers from 1 to 10 using while loop
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int x=1,n=10,sum=0;
while(x<=n)
    {
        sum=sum+x;
        x++;
    }
cout<<"TOTAL is "<<sum;
getch();
}

(5)

Program to add 10 integer numbers from 1 to 10 using do...while loop
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int x=1,n=10,sum=0;
do
    {
        sum=sum+x;
        x++;
    }while(x<=n);
    cout<<"TOTAL is "<<sum;
getch();
}

(6)
Program to allot Grade to students on the basis of their percentage
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int hindi,english,maths,total,percent;
cout<<"enter hindi marks ";
cin>>hindi;
cout<<"enter english marks ";
cin>>english;
cout<<"enter maths marks ";
cin>>maths;
total= hindi + english + maths;
cout<<"total is "<<total<<endl;
percent = total/3;       /*switch case can not be used for conditions*/
if(percent >= 90 && percent <=100)
  {    cout<<"Excellent ";  }
else if(percent >= 80 && percent <= 89)
    {cout<<"A+ ";                }
else if(percent >= 70 && percent <= 79)
    {cout<<"A ";  }
else if(percent >= 60 && percent <= 69)
  {    cout<<"B+ ";                }
else if(percent >= 50 && percent <= 59)
    {cout<<"B ";  }
else if(percent >= 40 && percent <= 49)
  {    cout<<"C ";    }
else if(percent >= 0 && percent <= 39)
    {cout<<"F "; }
getch();

(7)

Program to find maximum of three numbers
#include<iostream.h>
#include<conio.h>
int maximum(int a,int b, int c);
void main()
{
    int x,y,z,max;
    cout<<"enter three numbers ";
    cin>>x>>y>>z;
    max=maximum(x,y,z);
    cout<<"maximum is "<<max;
    getch();
}
int maximum(int a,int b,int c)
{
    if(a>b)
        if(a>c)
            return a;
        else
            return c;

    else
        if(b>c)
            return b;
        else
            return c;

}

(8)

Program to perform arithmetic operations
#include<iostream.h>
#include<conio.h>
#include<stdlib.h> //for exit function
#include<dos.h> //for sleep function
double operation(float, float ,char);
void main()
{
    clrscr();
    float x,y,z;
    char op;
    cout<<"enter first value ";
    cin>>x;
    cout<<"enter second value ";
    cin>>y;
    cout<<"enter operator ";
    cin>>op;
    z=operation(x,y,op);
    cout<<z;
    getch();
}
double operation(float a,float b, char op)
{
    float c;
    switch(op)
    {
        case '+' :  c=a+b;
                        break;
        case '-' :  c=a-b;
                        break;
        case '*' :  c=a*b;
                        break;
        case '/' :  if(b==0)
                {
                    cout<<"wrong values";
                    sleep(5);
                    exit(0);
                }
                else
                c=a/b;
                break;
        case 'q' :  exit(0);
        default  :  cout<<"worng operator";
                        break;
    }
    return c;
}

(9)

Program to check maximum number using function and pointer
#include<iostream.h>
#include<conio.h>
long int max(int *,int *);
void main()
{
clrscr();
int *p,a,b;
cout<<"ENter two values ";
cin>>a>>b;
*p=(a,b);
cout<<"MAximum is "<<*p;
getch();
}
long int max(int *x,int *y)
{
if(*x>*y)
    return *x;
else
    return *y;

}

(10)

Program to find sum of two numbers using "functions"
#include<iostream.h>
#include<conio.h>
void sum(int a,int b);
void main()
{
clrscr();
int a,b;
cout<<"enter 2 vaues";
cin>>a>>b;
sum(a,b);
getch();
}
void sum(int a,int b)
 {
  int sum=0;
  sum=a+b;
  cout<<"sum is"<<sum;
 }

(11)

Program to find Factorial of number
#include<iostream.h>
#include<conio.h>
void factorial(int a);
void main()
{
clrscr();
int a;
cout<<"enter a no.";
cin>>a;
factorial(a);
getch();
}
void factorial(int a)
 {
  int fact=1;
  for(int i=1;i<=a;i++)
     {
      fact=fact*i;
     }
cout<<"factorial is"<<fact;
 }

(12)

Program to find whether a number is Prime or not
#include<iostream.h>
#include<conio.h>
void prime(int a);
void main()
{
clrscr();
int a;
cout<<"enter a no.";
cin>>a;
if(a==1)
  {
   cout<<"1 is neither prime nor composite";
  }
prime(a);
getch();
}
void prime(int a)
{
int flag=0;
for(int i=2;i<a;i++)
   {
    if(a%i==0)
      {
       flag=1;
       break;
      }
   }
if(flag==0)
  {
   cout<<"prime no.";
  }
else
  {
   cout<<"not a prime no.";
  }
}

(13)

Program to check whether a number is Palindrome or not
#include<iostream.h>
#include<conio.h>
void palindrome(int a);
void main()
{
clrscr();
int a;
cout<<"enter a no.";
cin>>a;
palindrome(a);
getch();
}
void palindrome(int a)
{
 int r,b=0,f=100,on=a;
 while(a>0)
    {
     r=a%10;
     a=a/10;
     b=b+(r*f);
     f=f/10;
    }
if(on==b)
  {
   cout<<"palindrome";
  }
else
 {
  cout<<"not a palindrome";
 }
}

(13)

Program to check whether an alphabet is a Vowel or not
#include<iostream.h>
#include<conio.h>
void vowel(char a);
void main()
{
clrscr();
char a;
cout<<"enter a alphabet";
cin>>a;
vowel(a);
getch();
}
void vowel(char a)
{
 if(a=='a'||a=='e'||a=='i'||a=='o'||a=='u')
   {
    cout<<"vowel";
   }
 else
  {
   cout<<"not a vowel";
  }
}

(14)

Program to find maximum in three numbers
#include<iostream.h>
#include<conio.h>
void greater(int a,int b,int c);
void main()
{
clrscr();
int a,b,c;
cout<<"enter 3 nos";
cin>>a>>b>>c;
greater(a,b,c);
getch();
}
void greater(int a,int b,int c)
  {
   if(a>b&&a>c)
     {
      cout<<a<<"is greater";
     }
   else
   {
    if(b>c)
      {
       cout<<b<<" is greater";
      }
    else
      {
       cout<<c<<" is greater";

      }
   }
}

(15)

Program to check whether an year is a leap year or not
#include<iostream.h>
#include<conio.h>
void lyear(int a);
void main()
{
clrscr();
int a;
cout<<"enter a no.";
cin>>a;
lyear(a);
getch();
}
void lyear(int a)
 {
   cout<<"\n\n";
  if(a%100==0&&a%400==0||a%4==0)
    {
     cout<<a<<"is a leap year";
    }
  else
    {
     cout<<a<<"it is not a leap year";
    }
}

(16)

Program to Swap two numbers
#include<iostream.h>
#include<conio.h>
void swap(int a,int b);
void main()
{
clrscr();
int a,b;
cout<<"enter 2 nos";
cout<<"\n\n";
cin>>a;
cout<<"\n\n";
cin>>b;
cout<<"\n\n";
cout<<"before swapping"<<"\n\n"<<"a="<<a;
cout<<"\n\n";
cout<<"b="<<b;
swap(a,b);
getch();
}
void swap(int a,int b)
     {
       cout<<"\n\n";
       int temp;
       temp=a;
       a=b;
       b=temp;
       cout<<"after swapping"<<"\n\n"<<"a="<<a;
       cout<<"\n\n";
       cout<<"b="<<b;
     }

(17)

Program to illustrate RETURN BY REFERENCE
#include<iostream.h>
#include<conio.h>
int &max(int &a,int &b)
    {
      if(a>b)
        return a;
       else
          {
            return b;
          }
     }
void main()
{ clrscr();
int a,b;
cout<<"enter 2 nos";
cout<<"\n\n";
cin>>a;
cout<<"\n\n";
cin>>b;
max(a,b)=1;
if(a==1)
  {
  cout<<"\n\n";
  cout<<"a is greater";
  }
if(b==1)
  {
   cout<<"\n\n";
   cout<<"b is greater";
  }
getch();
}

(18)

Program to find Prime number from 1 to 100
#include<iostream.h>
#include<conio.h>
void prime();
void main()
{
clrscr();
prime();
getch();
}
void prime()
 {
  int flag=0;
  cout<<"prime nos. are";
  for(int i=3;i<=100;i++)
     {
        flag=0;
      for(int j=2;j<i;j++)
         {
            if(i%j==0)
              {
               flag=1;
               break;
              }
         }
         if(flag==0)
            cout<<i<<"\t";
      }
 }

(19)

Program to perform "1.SUM OF DIGITS" & "2.REVERSE OF A NUMBER"
#include<iostream.h>
#include<conio.h>
void sod(int a);
void reverse(int a);
void main()
{
int op,a;
clrscr();
cout<<"1.sum of digit\n\n";
cout<<"2.reverse a no.\n\n";
cin>>op;
switch(op)
 {
case 1: sod(a);
        break;
case 2: reverse(a);
        break;
case 3:cout<<"invalid option";
}
getch();
}
void sod(int a)
 {
  int sum=0,r;
    cout<<"\n\n";
    cout<<"enter a no.";
    cin>>a;
   while(a>0)
      {
    r=a%10;
    a=a/10;
    sum=sum+r;
   }
    cout<<"\n\n";
    cout<<"sum is"<<sum;
 }
 void reverse(int a)
 {
  int b=0,r;
  cout<<"\n\n";
  cout<<"enter a no";
  cin>>a;
  while(a>0)
   {
    r=a%10;
    a=a/10;
    b=b*10+r;
   }
    cout<<"\n\n";
    cout<<"reverse is"<<b;
 }

(20)

Program to find FACTORIAL using "RECURSION"
#include<iostream.h>
#include<conio.h>
int fact(int n)
 {
  int f=1;
  if(n==1)
    {
     return f;
    }
  else
    {
    f=n*fact(n-1);
    return f;
    }
  }
void main()
{
clrscr();
int n;
cout<<"enter a no.";
cin>>n;
cout<<"\n\n";
cout<<"factorial is"<<fact(n);
getch();
}

(21)

Program to calculate length of string
#include<stdio.h>
#include<iostream.h>
#include<conio.h>
void count(char a[]);
void main()
{
clrscr();
char a[10],i;
cout<<"\n";
cout<<"enter a string";
cout<<"\n";
gets(a);
count(a);
getch();
}
void count(char a[])
 {
  int countt=0,i;
  for(i=0;a[i]!='\0';i++)
     {
      countt++;
     }
   cout<<"\n";
   cout<<"the length of string is"<<"\t"<<countt;
 }

(22)

Program to calculate number of VOWELS in a string
#include<stdio.h>
#include<iostream.h>
#include<conio.h>
void vowel(char a[]);
void main()
{
clrscr();
char a[10];
cout<<"enter a string";
gets(a);
vowel(a);
getch();
}
void vowel(char a[])
 {
  int i,count;
  for(i=0;a[i]!='\o';i++)
     {
      if(a[i]=='a'||a[i]=='e'||a[i]=='i'a[i]=='o'||a[i]=='u')

         count++;

     }
  cout<<"no. of vowels in a string are"<<count;
 }
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(23)

Program to check whether a string is a PALINDROME or not
#include<string.h>
#include<stdio.h>
#include<iostream.h>
#include<conio.h>
void palindrome(char a[]);
void main()
{
clrscr();
char a[10];
cout<<"\n\n";
cout<<"enter a string";
cout<<"\n\n";
gets(a);
cout<<"\n";
palindrome(a);
getch();
}
void palindrome(char a[])
 {
  int i,n,flag=0;
  n=strlen(a);
  for(i=0;i<n/2;i++)
     {
      if(a[i]!=a[n-1-i])
        {
         flag=1;
         break;
        }
      }
  if(flag==0)
    {
     cout<<"\n";
     cout<<"it is a palindrome";
    }
  else
   {
    cout<<"\n";

    cout<<"it is not a palindrome";
   }
 }