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PA1/PA1/main.c

/************************************************************************************************** * Programmer: Andrew S. O'Fallon * * Class: CptS 121; Lab Section 0 * * Programming Assignment: Solution to Programming Assignment #1 - * * Equation Evaluator * * Date: * * * * Description: This program evaluates seven different equations. * * The constants represent coefficients and * * coordinates that are used in the provided equations. * * The user is prompted to enter the values, and the formulas * * listed below are evaluated based on the user input. * * The equations are displayed with the constants and results. * * * * Inputs: acceleration, mass_newton, radius, cylinder_height, plaintext_character, * * mass1, mass2, distance_gravity, x1, x2, y1, y2, theta, r1, r2, * * vin, x, z, a * * Constants: PI, G * * Computations: See relevant formulas * * Outputs: force_newton, volume_cylinder, encoded_character, * * force_gravity, vout, distance_points, y * * * * This program does not provide error checking and only * * uses sequential statements. This program defines only one * * function, main (). * * * * Relevant Formulas (The equation numbers are referenced in the comments of * * the program): * * (1)Newton's 2nd Law: force_newton = mass_newton * acceleration * * (2)Volume of a cylinder: volume_cylinder = PI * radius^2 * cylinder_height * * (3)Character encoding: encoded_character = (plaintext_character - 'a') + 'A' * * (4)Gravity: force_gravity = G * mass1 * mass2 / distance_gravity^2 * * (5)Resistive divider: vout = r2 / (r1 + r2) * vin * * (6)Distance between two points: distance_points = square root of ((x1 - x2)^2 + * * (y1 - y2)^2) * * (7)General equation: (89 / 27) - z * x + a / (a % 2) * *************************************************************************************************/ #include <stdio.h> /* Include the standard input/output library for functions printf ( ) and scanf ( )*/ #include <math.h> /* Included for sqrt ( ), sin ( ), and cos ( ) */ #define PI 3.141592 /* Define a constant macro to represent PI for the relevant equations */ #define G 6.67e-11 /* Define a constant macro for the gravitational constant */ int main(void) /* The main ( ) function is the starting point of the program */ { int a = 0; /* Stores the value for the user inputted a coefficient in equation (7) */ char plaintext_character = '\0', /* Stores the character inputted by the user for use in equation (3) */ encoded_character = '\0'; /* Stores the result of the encoding from equation (3) */ double mass_newton = 0.0, /* Stores the mass in grams of the value inputted by the user for equation (1) */ acceleration = 0.0, /* Stores the acceleration in m/s^2 of the value inputted by the user for equation (1) */ force_newton = 0.0, /* Stores the result of equation (1) */ radius = 0.0, /* Stores the radius of the cylinder inputted by the user for equation (2) */ cylinder_height = 0.0, /* Stores the height of the cylinder inputted by the user for equation (2) */ volume_cylinder = 0.0, /* Stores the result of equation (2) */ mass1 = 0.0, /* Stores the mass of one object inputted by the user for equation (4) */ mass2 = 0.0, /* Stores the mass of a second object inputted by the user for equation (4) */ distance_gravity = 0.0, /* Stores the distance between objects inputted by the user for equation (4) */ force_gravity = 0.0, /* Stores the result of equation (4) */ r1 = 0.0, /* Stores the first resistor value entered by the user for equation (5) */ r2 = 0.0, /* Stores the second resistor value entered by the user for equation (5) */ vin = 0.0, /* Stores the input voltage value entered by the user for equation (5) */ vout = 0.0, /* Stores the result of the resisitive divider equation (5) */ x1 = 0.0, /* Stores the x1 value inputted by the user for equation (6) */ x2 = 0.0, /* Stores the x2 value inputted by the user for equation (6) */ y1 = 0.0, /* Stores the y1 value inputted by the user for equation (6) */ y2 = 0.0, /* Stores the y2 value inputted by the user for equation (6) */ distance_points = 0.0, /* Stores the distance between two points computed from equation (6) */ x = 0.0, /* Stores x value inputted by user for equation (7) */ z = 0.0, /* Stores z value inputted by user for equation (7) */ y = 0.0; /* Stores the result of the general equation (7) */ printf("*************** WELCOME TO THE EQUATION EVALUATOR **************\n\n"); /* Prompt the user for 2 floating-point values that are used in Netwon's 2nd Law of Motion equation (1) */ printf("Please enter the mass and acceleration (both floating-point values) for use in Newton's Second Law: "); /* Read the floating-point values into the proper variables: do not forget the "address of" operator (&) before each variable */ scanf("%lf%lf", &mass_newton, &acceleration); /* Calculate the result of equation (1), which is force on an object provided its mass and acceleration */ force_newton = mass_newton * acceleration; /* Print out the result of equation (1) */ printf("Newton's Second Law: force = mass * acceleration = %lf * %lf = %lf\n", mass_newton, acceleration, force_newton); /* Prompt the user for 2 floating-point values that are used in volume of a cylinder equation (2) */ printf("\nPlease enter the radius and height (both floating-point values) for use in a volume of cylinder equation: "); /* Read the floating-point values into the proper variables that are used in equation (2) */ scanf("%lf%lf", &radius, &cylinder_height); /* Calculate the result of equation (2), which is the volume of the cylinder derived from radius and height of it */ volume_cylinder = PI * radius * radius * cylinder_height; /* Print out the result of equation (2) */ printf("Volume of a cylinder: volume_cylinder = PI * radius^2 * height = %lf * %lf^2 * %lf = %lf\n", PI, radius, cylinder_height, volume_cylinder); /* Prompt the user for 1 character value for use in equation (3) */ printf("\nPlease enter the plaintext character for use in a character encoding equation: "); /* Read the character into the proper variable that is used in equation (3) */ /* Recall a space between the " and %c ignores all white space characters */ scanf(" %c", &plaintext_character); /* Calculate the result of equation (3), which is the encoded character */ encoded_character = (plaintext_character - 'a') + 'A'; /* Print out the result of equation (3) */ printf("Character encoding: encoded_character = (plaintext_character - 'a') + 'A' = %c - %c + %c = %c\n", plaintext_character, 'a', 'A', encoded_character); /* Prompt the user for 3 floating-point values that for use in equation (4) */ printf("\nPlease enter the masses of two objects and the distance between the objects\n"); printf(" (all floating-point values) for use in gravitational force between two objects equation: "); /* Read the floating-point values into the proper variables for equation (4) */ scanf("%lf%lf%lf", &mass1, &mass2, &distance_gravity); /* Calculate the result of equation (4), which is the gravitational force */ force_gravity = G * mass1 * mass2 / (distance_gravity * distance_gravity); /* Print out the result of equation (4) */ printf("Gravity: force = G * mass1 * mass2 / distance^2\n"); printf(" = %.12lf * %lf * %lf / %lf^2 = %.12lf\n", G, mass1, mass2, distance_gravity, force_gravity); /* Prompt the user for 3 floating-point values that are used in the resistive divider equation (5) */ printf("\nPlease enter two resistance values and an input voltage (all floating-point values) for use in\n"); printf(" resisitve divider equation: "); /* Read the floating-point values into the proper variables for equation (5) */ scanf("%lf%lf%lf", &r1, &r2, &vin); /* Calculate the ouptut voltage for the resistive divider equation (5) */ vout = r2 / (r1 + r2) * vin; /* Print out the result of equation (5) */ printf("Resistive divider: vout = r2 / (r1 + r2) * vin = %lf / (%lf + %lf) * %lf = %lf\n", r2, r1, r2, vin, vout); /* Prompt the user for the coordinates of two points for use in equation (6) */ printf("\nPlease enter the x1, y1, x2, and y2 (all floating point values) for use in a distance between points equation: "); /* Read in the floating-point values in the correct order for equation (6) */ scanf("%lf%lf%lf%lf", &x1, &y1, &x2, &y2); /* Calculate the distance between points for equation (6) */ distance_points = sqrt(((x1 - x2) * (x1 - x2)) + ((y1 - y2) * (y1 - y2))); /* Print out the distance between two points derived from equation (6) */ printf("\nDistance between 2 pts: distance = sqrt ((x1 - x2)^2 + (y1 - y2)^2)\n"); printf(" = sqrt ((%lf - %lf)^2 + (%lf - %lf)^2) = %lf\n", x1, x2, y1, y2, distance_points); /* Prompt the user for 2 floating-point and 1 integer values to be used in the general equation calculation (7) */ printf("\nPlease enter x and z (both floating_point values) and a (an integer value)\n"); printf(" for use in a general equation: "); /* Get the values needed for equation (7) */ scanf("%lf%lf%d", &x, &z, &a); /* Calculate the result of equation (7), the result is a y-coordinate */ y = ((double)89 / 27) - z * x + a / (a % 2); /* Print the result of the general equation (7) */ printf("general equation: y = 89/27 - z * x + a / (a %% 2)\n = %lf - %lf * %lf + %d / (%d %% 2) = %lf\n\n", ((double)89 / 27), z, x, a, a, y); return 0; } /* End of program */