Example: Profit and Profit Margin Calculator in C

// Profit and Profit Margin Calculator
#include <stdio.h>

int main() {
    // Step 1: Declare variables for revenue, expenses, profit, and profit margin.
    float revenue;
    float expenses;
    float profit;
    float profitMargin;

    // Step 2: Prompt user for total revenue.
    printf("Enter total revenue: $");
    scanf("%f", &revenue);

    // Step 3: Prompt user for total expenses.
    printf("Enter total expenses: $");
    scanf("%f", &expenses);

    // Step 4: Calculate profit.
    profit = revenue - expenses;

    // Step 5: Calculate profit margin only if revenue is not zero to avoid division by zero.
    if (revenue != 0) {
        profitMargin = (profit / revenue) * 100;
    } else {
        profitMargin = 0.0; // If no revenue, no margin.
    }

    // Step 6: Display the calculated profit and profit margin.
    printf("\n--- Profitability Report ---\n");
    printf("Total Revenue:   $%.2f\n", revenue);
    printf("Total Expenses:  $%.2f\n", expenses);
    printf("----------------------------\n");
    printf("Net Profit:      $%.2f\n", profit);
    printf("Profit Margin:   %.2f%%\n", profitMargin); // Display as percentage

    return 0;
}