C++ program to print an lower triangle using stars.

#include<iostream.h>
#include<conio.h>
void main()
{
  int j,i,k,l;
  char c;
  clrscr();
  do
  {
     cout<<"Enter the number of stars in the base..";
     cin>>k;
     for (i=1;i<=k;i++)
     {    
         for (j=1;j<=i;j++)
            cout<<"* ";
         cout<<endl;
     }
     cout<<"\nWant to try more..(y/n)\n";
     cin>>c;
  }
  while(c=='y');
  getch();
}

Program to check if the given Value is of type Int in CPP

 

#include <iostream>
using namespace std;

bool isNumber(string s)
{
    for (int i = 0; i < s.length(); i++)
        if (isdigit(s[i]) == false)
            return false;
 
    return true;
}

int main() {
    // Saving the input in a string
    string str = "";
    
    cout << "Enter Value.\n";
    cin >> str;
 
    // Function returns 1 if all elements
    // are in range '0-9'
    if (isNumber(str))
        cout << "Entered Value is Integer";
 
    // Function returns 0 if the input is
    // not an integer
    else
        cout << "Entered Value is String";
        
    return 0;
}

C++ PROGRAM TO DISPLAY ODD NUMBERS FROM 1 TO N

#include <iostream>

using namespace std;

int main()
{
    int n;
    cout<<"Enter the Limit\n";
    cin>>n;
    cout<<"Odd numbers between 1 and "<<n<<" are\n";
    for(int i=1;i<=n;i++)
    {
        if(i%2 != 0)
            cout<<i<<"\n";
    }
    return 0;
}

 

C++ File Handling Program

Write a program that shows the use of read() and write() to handle file I/O involving objects.

#include<iostream.h>
#include<fstream.h>
#include<iomanip.h>
class INVENTORY
{
  char name[10];
  int code;
  float cost;
  public:
    void readdata(void);
    void writedata(void);
};
void INVENTORY :: readdata(void)
{
  cout<<"\n Enter name:";cin>>name;
  cout<<"\n Enter code:";cin>>code;
  cout<<"\n Enter cost:";cin>>cost;
}
void INVENTORY :: writedata(void)
{
  cout<<setiosflags(ios::left)
  <<setw(10)<<name
  <<setiosflags(ios::right)
  <<setw(10<<code)
  <<setprecision(2)
  <<setw(10)<<cost<<endl;
}
int main()
{
  INVENTORY item[3];
  fstream file;
  file.open("Stock.dat",ios::in|ios::out);
  cout<<"\n Enter details for three items \n";
  for(int i=0;i<3;i++)
  {
    item[i].readdata();
    file.write((char *) & item[i],sizeof(item[i]));
  }
  file.seekg(0);
  cout<<"\nOutput\n";
  for(i=0;i<3;i++)
  {
    file.readdata((char *) &item[i],sizeof(item[i]));
    item[i].writedata();
  }
  file.close();
  return 0;
}

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C++ program to overload the unary minus operator using friend function.

Write a program to overload the unary minus operator using friend function.

#include<iostream>

using namespace std;

class space{

  int x;

  int y;

  int z;

  public:

    void getdata(int a,int b,int c);

    void display(void);

    friend void operator-(space &s);

};

void space :: getdata(int a,int b,int c){

  x=a;

  y=b;

  z=c;

}

void space :: display(void){

  cout<<x<<" ";

  cout<<y<<" ";

  cout<<z<<"\n";

}

void operator-( space &s){

  s.x=-s.x;

  s.y=-s.y;

  s.z=-s.z;

}

int main(){

  space s;

  s.getdata(10,-20,30);

  cout<<"S : ";

  s.display();

  -s;

  cout<<"S :";

  s.display();

  return 0;

}

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OUTPUT

 

Template Function

Write a template function that swaps the values of two arguments passed to it. In main( ), use the function with integers and characters.

#include<iostream.h>
using namespace std;
template <class T>
void swap(T &a,T &b)
{
    T temp=a;
    a=b;
    b=temp;
}
void func(int x,int y,char w,char z)
{
    cout<<"x and y before swap: "<<x<<y<<"\n";
    swap(x,y)
    cout<<"x and y after swap: "<<x<<y<<"\n";
    cout<<"w and z before swap: "<<w<<z<<"\n";
    swap(w,z)
    cout<<"w and z after swap: "<<w<<z<<"\n";
}
int main()
{
    fun(10,20,’s’,’S’);
    return 0;
}


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C++ PROGRAM - FACTORIAL USING RECURSION.

Write a C++ program which calculates the factorial of a given number using recursion.

#include<conio.h>
#include<iostream.h>
long factorial (long a)
{
    if (a > 1)
        return (a * factorial (a-1));
    else
        return (1);
}
int main ()
{
    long ln;
    clrscr();
    cout << "Enter a number: ";
    cin >> ln;
    cout << ln << "!" << " = " << factorial (ln);
    getch();
    return 0;
}

OUTPUT

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