Program for Product of two numbers in C

January 31, 2023

How to multiply two numbers in C?

We are going to learn to do the product of two numbers in C language. There are different ways to multiply numbers in C language. The most informative way to learn is by multiplying two floating point numbers in C as it includes both basic knowledge and a bit more knowledge due to floating points. 

Product-of-two-numbers-in-C

Syntax:

General code to perform product of two numbers in C.
 product = num1 * num2;

Steps to multiply two number:

  • Step 1: Start
  • Step 2: Declare the variable num1=2, num2=4, product.
  • Step 3: Read input num1 and num2 from the user or predefine it according to the need.
  • Step 4: Multiply num1 and num2 and store the value in product.
  • Step5: Display the number in the stdout console.
  • Step 6: Program end.
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Working:

In these program we will learn to do the product of two number using various different ways.

Example 1 :

A simple program where we will multiply two variables that are predefined.

Run 
#include<stdio.h>
int main() {
    double num1=3.1, num2=4.2, product;
    // Calculating product
    product = num1 * num2;

    //  displays number up to 2 decimal point
    printf("Product = %.2lf", product);
    
    return 0;
}

Output:

Product = 13.02

Example 2 :

Program where we will do the product of two floating point numbers given by the users.

Run 
#include<stdio.h>
int main() {
    double num1, num2, product;
    printf("Enter two numbers: ");
    scanf("%lf %lf", &num1, &num2);  
 
    // Calculating product
    product = num1 * num2;

    // %.2lf displays number up to 2 decimal point
    printf("Product = %.2lf", product);
    
    return 0;
}

Input:

Enter two numbers: 9.6
5.24

Output:

Product = 50.30
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Example 3 :

Program where we will multiply two floating point number in C using functions.

Run 
#include<stdio.h>
float multiply(float a, float b){
    return a * b;
}
int main(){
  float num1, num2, product;
  printf("Enter the first Number: ");
  scanf("%f", &num1);
  printf("Enter the second Number: ");
  scanf("%f", &num2);
  product  = multiply(num1, num2);
  printf("The Product of the numbers is : %.3f", product);
  return 0;
}

Input:

Enter the first Number: 5.25
Enter the second Number: 6.1

Output:

The Product of the numbers is : 32.0255

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