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In this example, the product of two floating-point numbers entered by the user is calculated and printed on the screen.

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To understand this example, you should have the knowledge of the following C programming topics:

• C Variables, Constants and Literals
• C Data Types
• C Input Output (I/O)
• C Programming Operators

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Program to Multiply Two Numbers

#include 
int main() {
    double a, b, product;
    printf("Enter two numbers: ");
    scanf("%lf %lf", &a, &b);  
 
    // Calculating product
    product = a * b;

    // Result up to 2 decimal point is displayed using %.2lf
    printf("Product = %.2lf", product);
    
    return 0;
}

Output

Enter two numbers: 2.4
1.12
Product = 2.69

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In this program, the user is asked to enter two numbers which are stored in variables a and b respectively.

printf("Enter two numbers: ");
scanf("%lf %lf", &a, &b); 

Then, the product of a and b is evaluated and the result is stored in product.

product = a * b;

Finally, product is displayed on the screen using printf().

printf("Product = %.2lf", product);

Notice that, the result is rounded off to the second decimal place using %.2lf conversion character.