Example: Shipping Charge Calculator with Discounts in C

// Shipping Charge Calculator with Discounts
#include <stdio.h>

int main() {
    // Step 1: Declare variables for weight, base rate, total cost, and discount rate.
    float weight_kg;
    float base_rate_per_kg = 5.00; // Example base rate: $5.00 per kg
    float total_cost;
    float discount_rate = 0.0; // Initialize discount rate to 0%

    // Step 2: Prompt user for package weight and read input.
    printf("Enter the package weight in kilograms: ");
    scanf("%f", &weight_kg);

    // Step 3: Calculate the initial total cost before discount.
    total_cost = weight_kg * base_rate_per_kg;

    // Step 4: Apply discounts based on weight using if-else if statements.
    if (weight_kg <= 5.0) {
        discount_rate = 0.0; // No discount for 5 kg or less
    } else if (weight_kg > 5.0 && weight_kg <= 10.0) {
        discount_rate = 0.10; // 10% discount for >5 kg to 10 kg
    } else if (weight_kg > 10.0 && weight_kg <= 20.0) {
        discount_rate = 0.15; // 15% discount for >10 kg to 20 kg
    } else { // weight_kg > 20.0
        discount_rate = 0.20; // 20% discount for >20 kg
    }

    // Step 5: Calculate the final cost after applying the discount.
    float discount_amount = total_cost * discount_rate;
    float final_cost = total_cost - discount_amount;

    // Step 6: Display the results to the user.
    printf("\n--- Shipping Details ---\n");
    printf("Package Weight: %.2f kg\n", weight_kg);
    printf("Base Rate: $%.2f per kg\n", base_rate_per_kg);
    printf("Initial Cost: $%.2f\n", total_cost);
    printf("Discount Applied: %.0f%%\n", discount_rate * 100);
    printf("Discount Amount: $%.2f\n", discount_amount);
    printf("Final Shipping Cost: $%.2f\n", final_cost);

    return 0;
}