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;
}

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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PASS BY REFERENCE

Program to swap two numbers using pass by reference

#include<iostream.h>
#include<conio.h>
void swap(int &x,int &y);  // function declaration
void main()
{
  int a,b;
  clrscr();
  cout<<"Enter two numbers a & b"<<endl;
  cin>>a>>b;
  cout<<"\nBefore swapping:\n";
  cout<<"a="<<a;
  cout<<"\nb="<<b;
  swap(a,b);     //function call
  cout<<"\nAfter swapping:\n";
  cout<<"a="<<a;
  cout<<"\nb="<<b;
  getch();
}
void swap(int &x,int &y)  //  arguments by reference
{
  int t;
  t=x;
  x=y;
  y=t;
}

OUTPUT

PASS BY ADDRESS

Program to swap two numbers using pass by address.

#include<iostream.h>
#include<conio.h>
void swap(int *x,int *y);
void main()
{
  int a,b;
  clrscr();
  cout<<"Enter two numbers a & b"<<endl;
  cin>>a>>b;
  cout<<"\nBefore swapping:\n";
  cout<<"a="<<a;
  cout<<"\nb="<<b;
  swap(&a,&b);
  cout<<"\nAfter swapping:\n";
  cout<<"a="<<a;
  cout<<"\nb="<<b;
  getch();
}
void swap(int *x,int *y)
{
  int t;
  t=*x;
  *x=*y;
  *y=t;
}

output