Contains some of the basic programs of C++ Programming Language.

1. 1. Write a program to accept three integers and print the largest of them?
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int a,b,c;
cout<<“Enter three numbers ”;
cin>>a>>b>>c;
if(a>b && a>c)
cout<<a;
else if(b>a && b>c)
cout<<b;
else if(c>a && c>b)
cout<<c;
getch();
}

2. 2. Write a program to input a character and check whether a given character is in alphabet or a
digit or any other special character.
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
char a;
cout<<“Enter a character ”;
cin>>a;
if(a>= && a<=)
cout<<“You have entered a lowercase alphabet”;
else if(a>= && a<= )
cout<<“You have entered an uppercase alphabet”;
else if(a>= && a<=)
cout<<“You have entered a digit”;
else
cout<<“You have entered a special character”;
getch();
}

3. 3. Write a program to print first ten natural numbers and their sum.
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int a,b=0;
for(a=1;a<=10;a++)
{
cout<<a<<endl;
b+=a;
}
cout<<“Summation ”<<b;
getch();
}

4. 4. Write a program to print the following series.
0 1 1 2 3 5 8 13
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
unsigned long first, second, third, n;
first=0;
second=1;
cout<<“How many elements you want to enter ”<<endl;
cin>>n;
cout<<first<<endl;
for(int i=2; i<n; i++)
{
third=first+second;
cout<<third;
first=second;
second=third;
}
getch();
}

5. 5. Write a program to check whether a given number is palindrome or not.
#include<iostream.h>
#include<conio.h>
void main()
{
int n, num, digit, rev=0;
cout<<“Enter any number ”;
cin>>num;
n=num;
do
{
digit=num%10;
rev=(rev*10)+digit;
num=num/10;
}
while(num!=10)
cout<<“The reverse of the number is ”<<rev;
if(n==rev)
cout<<“The number is a Palindrome”;
else
cout<<“The number is not a Palindrome”;
getch();
}

6. 6. Write a program to accept the marks of ten students and store them in an array. Also display the
total marks.
#include<iostream.h>
#include<conio.h>
void main()
{
int n, a[10], t=0;
for(n=1;n<=10;n++)
{
cout<<“Enter the marks of student ”<<n<<endl;
cin>>a[n];
t=t+a[n];
}
cout<<“The total of the marks is ”<<t;
getch();
}

7. 7. Write a program to search for a specific element in a 1-D array through linear search.
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int a[5], size, i, flag=0, num, pos;
cout<<“Enter the number of elements in an array ”;
cin>>size;
cout<<“Enter the elements of the array ”;
for(i=0;i<size;i++)
{
cin>>a[i];
}
cout<<“Enter the element to be searched ”;
cin>>num;
for(i=0;i<size;i++)
if(a[i]==num)
{
flag=1;
pos=i;
break;
}
if(flag==0)
{
cout<<“Element not found!”;
}
else
{
cout<<“Element found at position ”<<pos+1;
}
getch();
}

8. 8. Write a program to find the number of vowels in a given line of text using an array.
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
char line[100];
int vow=0;
cout<<“Enter a sentence ”<<endl;
gets(line) ;
for(int i=0 ; line[i] !=‘0’;i++)
{
switch(line[i])
{
case ‘a’;
case ‘A’;
case ‘e’;
case ‘E’;
case ‘I’;
case ‘I’;
case ‘o’;
case ‘O’;
case ‘u’;
case ‘U’;
vow++;
}
}
cout<<“Total number of vowels in the given line is ”<<vow;
getch();
}

9. 9. An array emp[20] contains the number of employees joined in different years. Write a
program to find out the number of year in which no employee joined.
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int emp[20], number_of_year=0;
cout<<“Enter the number of employees who joined in ”;
for(i=0;i<20;i++)
{
cout<<“Year is ”<<i+1<<endl;
cin>>emp[20];
if(emp[i]==0)
number_of_year=number_of_year+1;
}
cout<<“In ”<<number_of_year<<“ year number of employees joined”;
getch();
}

10. 10. Write a program to calculate the length of string without using a library function.
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
char str[20];
int a;
for(a=1; a<=20;a++)
{
cin>>str[a];
}
cout<<“Length of string is ”<<a;
getch();
}

11. 11. Write a program that checks whether the given character is alphanumeric or a digit by using
standard library function.
#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
void main()
{
char ch;
int a;
cout<<“Enter a character ”;
cin>>ch;
a=ch;
if(isalnum(a))
{
cout<<“Alphanumeric Character”;
}
else if(isalpha(a))
{
cout<<“Alphabetic Character”;
}
else if(isdigit(a))
{
cout<<“Numeric Character”;
}
else
cout<<“Other Character”;
getch();
}

12. 12. Write a program to swap two values and make a new program.
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
void swap(int &, int &)
int a, b;
cout<<“Enter the first number ”;
cin>>a;
cout<<“Enter the second number ”;
cin>>b;
swap(a, b);
cout<<“After swapping the values are ”<<a<<b;
getch();
}
void swap(int &x, int &y)
{
int z;
z=x;
x=y;
y=z;
cout<<“The swapped values are ”<<x<<y;
}

13. 13. Write a program to generate the following output:
#include<iostream.h>
#include<conio.h>
void main()
{
int a, b;
for(a=1;a<=5;a++)
{
for(b=1;b<=a;b++)
{
cout<<“* ”;
}
cout<<endl;
}
getch();
}
*
* *
* * *
* * * *
* * * * *

14. 14. Write a function that finds a sub-string from a given string and returns the string to its caller
function.
#include<iostream.h>
#include<conio.h>
void main()
{

15. 15. Write a program that generates the following output:
#include<iostream.h>
#include<conio.h>
void main()
{
int a, b, c, d;
for(a=1;a<=4;a++)
{
for(b=1;b<=a;b++)
{
cout<<“* ”;
}
cout<<endl;
}
for(c=1;c<=3;c++)
{
for(d=3;d>=c;d‒‒)
{
cout<<“* ”;
}
cout<<endl;
}
getch();
}
*
* *
* * *
* * * *
* * *
* *
*