Table of Contents
C++ program to Multiply two integers|in 6ways
In this tutorial, we will discuss the C++ program to multiply of two numbers
In this post, we are going to learn how to find multiplication of two numbers via different 6 ways in C++ language
Code to Multiply two integers
Code to Multiply two integers – standard method
Program 1
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int num1=50,num2=20, product;
product=num1*num2;
cout << "Product of "<<num1<<" and "<<num2<<" is :"<< product<<endl;
getch();
return 0;
}
When the above code is executed, it produces the following result
Product of 50 and 20 is: 1000
In this program,
- Integer variable num1 and num2 both are declared and initialized
- The num1 and num2 both are multiplied together and the value assigned to the integer variable product
- Finally the program is displayed the output using cout<<
Code to Multiply two integers – Using user input
Program 2
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int num1,num2;
cout<<"Enter two numbers: ";
//The program ask to enter two numbers
cin>>num1>>num2;
//store two integer numbers in variable num1 and num2 respectively
//performs multiplication and stores the result in variable product
int product=num1*num2;
cout << "Product of "<<num1<<" and "<<num2<<" is :"<< product<<endl;
//display the product of two numbers
getch();
return 0;
}
When the above code is executed, it produces the following result
Enter two numbers 24 12 product of 24 and 12 is: 288
in this program,
- Integer variable num1 and num2 both are declared,
- The program takes input from the user
- Then the user enters the input value for num1 and num2
- The program will read the input using cin>> and store the variables in num1, num2.
- The num1 and num2 both are multiplied together and the value assigned to the integer variable product
- Finally the program is displayed the output using cout<<
Code to Multiply two integers – Using function
Program 3
#include <iostream>
#include <conio.h>
using namespace std;
int multiply(int x, int y);//function prototype
int main()
{
int num1,num2;
cout<<"Enter two numbers: ";
//The program ask to enter two numbers
cin>>num1>>num2;
//store two integer numbers in variable num1 and num2 respectively
//performs multiplication and stores the result in variable product
int product=multiply(num1,num2);
cout << "Product of "<<num1<<" and "<<num2<<" is :"<< product<<endl;
//display the product of two numbers
getch();
return 0;
}
int multiply(int x, int y)
{
return(x*y);//return the result to main
}
When the above code is executed, it produces the following result
Enter two numbers 40 30 product of 40 and 30 is: 1200
Approach
- Declare a function named as multiply() with two integer parameters
- Declare num1,num2 and product.
- The program takes input from the user
- Then the user enters the input value for num1, num2
- the program will read the input using cin>> and store the variables in num1, num2 respectively
- define the function (multiply())for find product
- Call the function to produce output
- finally, the program displays the result of multiplication using cout<<
Code to Multiply two integers – Using recursion
Program 4
#include <iostream>
#include <conio.h>
using namespace std;
int multiply(int,int);//function prototype
int main()
{
int num1,num2;
cout<<"Enter two numbers: ";
//The program ask to enter two numbers
cin>>num1>>num2;
//store two integer numbers in variable num1 and num2 respectively
//performs multiplication and stores the result in variable product
int product=multiply(num1,num2);
cout << "Product of "<<num1<<" and "<<num2<<" is :"<< product<<endl;
//display the product of two numbers
getch();
return 0;
}
int multiply(int x, int y)
{
if(x<y){
return multiply(y,x);
}
else if(y!=0){
return(x+multiply(x,y-1));//return the result to main
}
else {
return 0;
}
}
When the above code is executed, it produces the following result
Enter two numbers 23 34 product of 40 and 30 is: 782
- Declare a function named as multiply() with two int parameters
- Declare num1,num2 and product.
- The program takes input from the user
- Then the user enters the input value for num1, num2
- The program will read the input using cin>> and store the variables in num1, num2 respectively
- Define the function (mutiply())for find multiplication recursively
- Call the function to produce output
- Finally, the program displays the result of multiplication using cout<<
Code to Multiply two integers – Using pointer
Program 5
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int num1,num2,mul;
int *ptr1,*ptr2;
cout<<"Enter two numbers: ";
//The program ask to enter two numbers
cin>>num1>>num2;
//store two integer numbers in variable num1 and num2 respectively
//performs multiplication and stores the result in variable product
ptr1=&num1;
ptr2=&num2;
mul=*ptr1 * *ptr2;
cout << "Product of "<<num1<<" and "<<num2<<" is :"<< mul<<endl;
//display the product of two numbers
getch();
return 0;
}
When the above code is executed, it produces the following result
Enter two numbers 54 43 product of 40 and 30 is: 2322
- Declare variables num1,num2 and mul.
- Declare pointer variables *ptr1, *ptr2.
- The program takes input from the user
- Then the user enters the input value for num1, num2
- The program will read the input using cin>> and store the variables in num1, num2 respectively
- Address of the variables num1 and num2 assigned to pointer variables ptr1 and ptr2 respectively
- calculate multiplication of the numbers using pointer variable and Assign the product value to mul variable
- Finally, the program displays the result using cout<<
Code to Multiply two integers – with out multiplication operator
Program 6
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int num1,num2,product=0;
cout << "Enter two numbers for multiply" << endl;
cin>>num1>>num2;
for(int i=1; i<=num2; i++){
product=product+num1;
}
cout<<"The product of "<<num1<<" and "<<num2<<" is :"<<product<<endl;
getch();
return 0;
}
When the above code is executed, it produces the following result
Enter two numbers for multiply 25 35 The product of 25 and 35 is: 875
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