No idea what I'm doing

Original - cpp Code #include <stdio.h> #include <math.h> #define PI 3.14159265 #define G 32.17 // The above are the libraries I've used, (stdio for basic screen input/output, and math for sine, cosine and power functions) // below them are 2 constants, Pi (to convert degrees to radians) and G (gravity, what planet is this?) // functions to calculate everything double get_time(double distance, double velocity, double theta) { // doing the calculations is rather simple, just use normal semantics // note that the cos (and sin) functions expect radians, not degrees, so they have to be converted (360 degrees = 2 Pi radians) return (distance / (velocity * cos(theta * PI / 180))); } double get_height(double velocity, double theta, double time) { // note the fact that to-the-power-of is a function! return ( velocity * sin(theta * PI / 180) * time - (G * pow(time, 2) / 2)); } int main(void) { // declarations for all the variables I'm going to use. // I'm using doubles, which is a large size floating point value. double theta, distance, velocity, time, height; // get inputs printf("Give theta (input angle): "); // printf puts something on the screen scanf("%lf", &theta); // scanf reads user input, in this case a double (%lf). printf("Give distance to target: "); // see also the comments later on. scanf("%lf", &distance); printf("Give projectile velocity: "); scanf("%lf", &velocity); // calculate results time = get_time(distance, velocity, theta); // these are the functions I defined above height = get_height(velocity, theta, time); // output results printf("Time of impact is %.2lf\n", time); // these printf's contain a parameter (marked by the %-sign) that is replaced by the variable specified later, in this case time. printf("Height of impact is %.2lf\n", height); // you can include any number of these parameters, as long as you supply a value for it to be replaced with. // in this case, I've used %lf, which tells the computer to expect a long float (double). If I wanted an integer, I would have used %d, %s for a string. // Use a book or google to find a complete list. // the .2 between the %-sign and the lf means it will round the value at 2 decimals. // exit return 0; // 0 indicates success, anything else is an error value. }

#include <stdio.h>
#include <math.h>
#define PI 3.14159265
#define G 32.17
// The above are the libraries I've used, (stdio for basic screen input/output, and math for sine, cosine and power functions)
// below them are 2 constants, Pi (to convert degrees to radians) and G (gravity, what planet is this?)
 
// functions to calculate everything
double get_time(double distance, double velocity, double theta)
{
    // doing the calculations is rather simple, just use normal semantics
    // note that the cos (and sin) functions expect radians, not degrees, so they have to be converted (360 degrees = 2 Pi radians)
    return (distance / (velocity * cos(theta * PI / 180)));
}
 
double get_height(double velocity, double theta, double time)
{
    // note the fact that to-the-power-of is a function!
    return ( velocity * sin(theta * PI / 180) * time - (G * pow(time, 2) / 2));
}
 
int main(void)
{
    // declarations for all the variables I'm going to use.
    // I'm using doubles, which is a large size floating point value.
    double theta, distance, velocity, time, height;
 
    // get inputs
    printf("Give theta (input angle): ");      // printf puts something on the screen
    scanf("%lf", &theta);            // scanf reads user input, in this case a double (%lf).
    printf("Give distance to target: ");        // see also the comments later on.
    scanf("%lf", &distance);
    printf("Give projectile velocity: ");
    scanf("%lf", &velocity);
 
    // calculate results
    time = get_time(distance, velocity, theta); // these are the functions I defined above
    height = get_height(velocity, theta, time);
 
    // output results
    printf("Time of impact is %.2lf\n", time);  // these printf's contain a parameter (marked by the %-sign) that is replaced by the variable specified later, in this case time. 
    printf("Height of impact is %.2lf\n", height);  // you can include any number of these parameters, as long as you supply a value for it to be replaced with.
                            // in this case, I've used %lf, which tells the computer to expect a long float (double). If I wanted an integer, I would have used %d, %s for a string. 
                            // Use a book or google to find a complete list.
                            // the .2 between the %-sign and the lf means it will round the value at 2 decimals.
 
    // exit
    return 0;      // 0 indicates success, anything else is an error value.
}