Thread: My Program for School. Help?

Am i using boolean values correctly? our professor wanted boolean value use for the if and else statements. Other comments and suggestions welcome. thanks.

Code:

#include <stdio.h>
#include <math.h>
#define GRAVITY 9.8
#define LIMIT 500
#define SEC 5


double calcTime(double height);
double calcShotDistance(double time, double velocity);
double getDoubleHeight();
double getDoubleShipWidth();
double getDoubleVelocity();
double getDoubleShipDistance();
int i........(double shipWidth, double shipDistance, double distance);
int isDistance(double distance);
int isTime(double time);


int main()
{         
        double height, velocity, shipWidth, shipDistance, time, distance;
        int boom, far, timeToHit;
         
        height = getDoubleHeight();
        shipDistance = getDoubleShipDistance();
        shipWidth = getDoubleShipWidth();
        velocity = getDoubleVelocity();
        time = calcTime(height);
        distance = calcShotDistance(time, velocity);
        boom = i........(shipWidth, shipDistance, distance);
        far = isDistance(distance); 
        timeToHit = isTime(time);


        if((boom == 1) && (far == 1))
        {
        printf("I think you hit China!!!\n");
        printf("Distance of ball: %.6f meters\n", distance);
        printf("Direct hit!!!\n");
        }
        else if((boom == 1) && (far == 0) && (timeToHit == 1))
        {
        printf("Look out beloooooooooooooooooooooooooooow!\n");
        printf("Distance of ball: %.6f meters\n", distance);
        printf("Direct hit!!!\n");
        }
        else if((boom == 0) && (far == 1))
        {
        printf("I think you hit China!!!\n");
        printf("Distance of ball: %.6f meters\n", distance);
        printf("You missed!\n");
        }
     else if ((boom == 0) && (far == 0) && (timeToHit == 1))
        {
        printf("Look out beloooooooooooooooooooooooooooow!\n");
        printf("Distance of ball: %.6f meters\n", distance);
        printf("You missed!\n");
        }
        else if((boom == 1) && (far == 0) && (timeToHit == 0))
        {
        printf("Distance of ball: %.6f meters\n", distance);
        printf("Direct hit!!!\n");
        }
        else
        {
        printf("Distance of ball: %.6f meters\n", distance);
        printf("You missed!\n");
        }


        return 0;
}


int isTime(double time)
{
        if (time > SEC)
        {
        return 1;
        }
        else
        {
        return 0;
        }
}


int isDistance(double distance)
{
        if (distance > LIMIT)
        {
        return 1;
        }
        else
        {
        return 0;
        }
}


int i........(double shipWidth, double shipDistance, double distance)
{
        if((distance < shipDistance + (shipWidth / 2.0)) && (distance > shipDistance - (shipWidth / 2.0)))
        {
        return 1;
        }
        else
        {
        return 0;
        }
}


double getDoubleHeight()
{
        double height;
        printf("Enter the height of the cliff (meters): ");
        scanf("%lf", &height);
        return height;
}


double getDoubleVelocity()
{
        double velocity;
        printf("Enter the velocity of the cannon ball (meters/second): ");
        scanf("%lf", &velocity);
        return velocity;
}


double calcShotDistance(double time, double velocity)
{
        double distance = time*velocity;
        return distance;
}
                     


double getDoubleShipWidth()
{
        double shipWidth;
        printf("Enter the width of the ship (meters): ");
        scanf("%lf", &shipWidth);
        return shipWidth;
}


double getDoubleShipDistance()
{
        double shipDistance;
        printf("Enter the distance of the ship from the cliff (meters): ");
        scanf("%lf", &shipDistance);
        return shipDistance;
}


double calcTime(double height)
{
        double time = sqrt(height / (GRAVITY / 2.0));
        return time;
}

i'm not shure but I think your prof wants somethinge like

Code:

        if( boom  && far )
        {
            ....
        }
        else if(  boom  &&  ! far  && timeToHit )
        {
            ...
        }
             ....

Kurt

Oh right! i remember learning that. thank you for your help.