Example: Rhombus Side Length from User Input Diagonals in C

// Rhombus Side Length from User Input Diagonals
#include <stdio.h>
#include <math.h> // Required for sqrt() function

int main() {
    // Step 1: Declare variables for diagonal lengths and side length
    double diagonal1, diagonal2, side;

    // Step 2: Prompt user for the first diagonal length
    printf("Enter the length of the first diagonal (d1): ");
    scanf("%lf", &diagonal1);

    // Step 3: Prompt user for the second diagonal length
    printf("Enter the length of the second diagonal (d2): ");
    scanf("%lf", &diagonal2);

    // Step 4: Validate inputs (diagonals must be positive)
    if (diagonal1 <= 0 || diagonal2 <= 0) {
        printf("Error: Diagonal lengths must be positive values.\n");
        return 1; // Indicate an error
    }

    // Step 5: Calculate half the lengths of the diagonals
    double halfDiagonal1 = diagonal1 / 2.0;
    double halfDiagonal2 = diagonal2 / 2.0;

    // Step 6: Apply the Pythagorean theorem
    double sideSquared = pow(halfDiagonal1, 2) + pow(halfDiagonal2, 2);

    // Step 7: Calculate the side length by taking the square root
    side = sqrt(sideSquared);

    // Step 8: Print the result
    printf("\nRhombus Diagonal 1: %.2f units\n", diagonal1);
    printf("Rhombus Diagonal 2: %.2f units\n", diagonal2);
    printf("Calculated Rhombus Side: %.2f units\n", side);

    return 0; // Indicate successful execution
}