C++ program to multiply two numbers

Here are the C++ programs to multiply two numbers .Here I have given different methods like multiply two numbers using multiplication operator, without using multiplication operator, using function, using recursion and using bitwise operator etc.

C++ program to multiply two numbers

#include<iostream>
using namespace std;
int main()
{
    int a,b,c;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    c=a*b;
    cout<<"Product = "<<c<<endl;
    return 0;
}

C++ program to multiply two numbers without using third variable

#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    a=a*b;
    cout<<"Product = "<<a<<endl;
    return 0;
}

C++ program to multiply two numbers using function

#include<iostream>
using namespace std;
int mul(int a,int b)
{
    return a*b;
}
int main()
{
    int a,b,c;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    c=mul(a,b);
    cout<<"Product = "<<c<<endl;
    return 0;
}

C++ program to multiply two numbers using pointers

#include<iostream>
using namespace std;
int main()
{
    int a,b,c;
    int *p,*q;
    p=&a;
    q=&b;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    c=*p**q;
    cout<<"Product = "<<c<<endl;
    return 0;
}

C++ program to multiply two numbers using bitwise operators

#include<iostream>
using namespace std;
int main()
{
    int a,b,temp,xo,sum=0;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    for(int i=0;i<b;i++)
    {
       temp=a;
       while(temp)
       {
           xo=sum^temp;
           temp=sum&temp;
           temp<<=1;
           sum=xo;
       }
    }
    cout<<"Product = "<<sum<<endl;
    return 0;
}

C++ program to multiply two numbers without using multiplication operator

#include<iostream>
using namespace std;
int main()
{
    int a,b,c=0;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    for(int i=0;i<b;i++)
      c+=a;
    cout<<"Product = "<<c<<endl;
    return 0;
}

C++ program to multiply two numbers using recursion

#include<iostream>
using namespace std;
int mult(int n1,int n2,int res)
{
    if(n2==0)
        return res;
    mult(n1,n2-1,res+n1);
}
int main()
{
    int a,b;
    cout<<"Enter Multiplicand and Multiplier : ";
    cin>>a>>b;
    cout<<"Product = "<<mult(a,b,0)<<endl;
    return 0;
}