C Programming: You are going to write an API for controlling an ant that lives i

Question

C Programming:

You are going to write an API for controlling an ant that lives in one-dimensional space! This API will be contained in two files ant.c and ant.h. The contents of ant.h is given below:

#ifndef _ant_h_
#define _ant_h_
struct ant {
int position;
int direction;
};

void init_ant (struct ant* a, int position);
void ant_turn (struct ant* a);
void ant_move (struct ant* a, unsigned int distance);
int ant_get_position (struct ant* a);
char* ant_get_direction (struct ant* a);

#endif /* _ant_h_ */

Your job is to write the file ant.c. Test your implementation using the following code test.c:

#include <stdio.h>
#include "ant.h"

void report (struct ant* a)
{
printf ("[Position: %i] ", ant_get_position(a));
printf ("[Direction: %s] ", ant_get_direction(a));
}

int main (int argc, char** argv)
{
struct ant bob;

init_ant (&bob, 10);
report (&bob);
ant_move (&bob, 5);
ant_move (&bob, 2);
report (&bob);
ant_turn (&bob);
ant_move (&bob, 20);
report (&bob);
}

If your implementation is working, the output of the mai functi shown above should look like the following: on Position 101 Direction: right] Position 17] Direction: right] Position -3] [Direction: left]

Explanation / Answer

ant.c file

#include "ant.h"

void init_ant (struct ant *a, int position)
{
a->position = position;
}
void ant_turn (struct ant *a)
{
a->position = (a->position) - 40;
}
void ant_move (struct ant *a, unsigned int distance)
{
a->position = a->position + distance;
}
int ant_get_position (struct ant *a)
{
return a->position;
}

char* ant_get_direction (struct ant *a)
{
if((a->position) > 0)
return "right";
else
return "left";
}

Output:

[Position: 10] [Direction: right]                                                                                                                

[Position: 17] [Direction: right]                                                                                                                

[Position: -3] [Direction: left]

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