Example: Electromagnetic Wave Classifier in C

// Electromagnetic Wave Classifier
#include <stdio.h>

int main() {
    // Step 1: Declare a variable to store the wavelength
    double wavelength_meters;

    // Step 2: Prompt the user to enter the wavelength
    printf("Enter the wavelength in meters (e.g., 5e-7 for 5x10^-7): ");

    // Step 3: Read the wavelength from the user
    if (scanf("%lf", &wavelength_meters) != 1) {
        printf("Invalid input. Please enter a numerical value.\n");
        return 1; // Indicate an error
    }

    // Step 4: Classify the wave based on its wavelength
    if (wavelength_meters < 1e-12) { // Less than 1 picometer
        printf("The wave is a Gamma Ray.\n");
    } else if (wavelength_meters >= 1e-12 && wavelength_meters < 1e-8) { // 1 pm to 10 nm
        printf("The wave is an X-ray.\n");
    } else if (wavelength_meters >= 1e-8 && wavelength_meters < 4e-7) { // 10 nm to 400 nm
        printf("The wave is Ultraviolet (UV) Light.\n");
    } else if (wavelength_meters >= 4e-7 && wavelength_meters < 7e-7) { // 400 nm to 700 nm
        printf("The wave is Visible Light.\n");
    } else if (wavelength_meters >= 7e-7 && wavelength_meters < 1e-3) { // 700 nm to 1 mm
        printf("The wave is Infrared (IR) Light.\n");
    } else if (wavelength_meters >= 1e-3 && wavelength_meters < 1) { // 1 mm to 1 meter
        printf("The wave is a Microwave.\n");
    } else if (wavelength_meters >= 1) { // Greater than or equal to 1 meter
        printf("The wave is a Radio Wave.\n");
    } else { // Should ideally not be reached with positive wavelength, but for completeness
        printf("Unable to classify the wave (wavelength out of typical positive range).\n");
    }

    return 0; // Indicate successful execution
}