C Program to Multiply two Floating Point Numbers?

In C, multiplying two floating-point numbers is a fundamental arithmetic operation. Floating-point numbers can represent real numbers with decimal points, such as 4320.0, -3.33, or 0.01226. The term "floating point" refers to the fact that the decimal point can "float" to support a variable number of digits before and after it.

Syntax

float result = float_num1 * float_num2;
double result = double_num1 * double_num2;

Floating Point Data Types

Example: Multiplying Two Float Numbers

This example demonstrates multiplication of two floating-point numbers with proper formatting −

#include <stdio.h>

int main() {
    float a, b, result;
    
    a = 11.23;
    b = 6.7;
    result = a * b;
    
    printf("First number: %.2f<br>", a);
    printf("Second number: %.2f<br>", b);
    printf("Product: %.3f<br>", result);
    
    return 0;
}

First number: 11.23
Second number: 6.70
Product: 75.241

Example: Using Double for Higher Precision

For calculations requiring higher precision, use double data type −

#include <stdio.h>

int main() {
    double num1, num2, product;
    
    num1 = 123.456789;
    num2 = 987.654321;
    product = num1 * num2;
    
    printf("First number: %.6f<br>", num1);
    printf("Second number: %.6f<br>", num2);
    printf("Product: %.6f<br>", product);
    
    return 0;
}

First number: 123.456789
Second number: 987.654321
Product: 121932.632653

Key Points

• Use float for single precision (4 bytes) and double for double precision (8 bytes).
• The printf format specifier %.nf controls decimal places displayed.
• Floating-point arithmetic may have small precision errors due to binary representation.

Conclusion

Multiplying floating-point numbers in C is straightforward using the * operator. Choose float for basic precision or double for higher precision calculations based on your requirements.