/* Name: Garrett Haldrup
# lab10.c
# Purpose: Solves problems assigned in Lab 10

*/

#include <stdio.h>
#include <math.h>
#include <assert.h>


float distance(float x1, float y1, float x2, float y2);
float perimeterOfTriangle(float x1, float y1, float x2, float y2, float x3, float y3);
float circleArea(float radius);
char scoreToLetter(int score);

int main(){
    
  float x1, y1, x2, y2, x3, y3;
  x1 = 1, y1 = 2, x2 = 4, y2 = 6, x3 = 5, y3 = 3;
  char list[] = {'F', 'D', 'E', 'C', 'B', 'A', 'N'};
  int count = 0;
    
  printf("\nTest cases for score to letter\n");
  for (int i = 51; i <= 101; i += 10) {
    char grade = scoreToLetter(i);
    assert(grade = list[count]);
    printf("The score of %d is letter grade: %c\n", i, scoreToLetter(i));
    printf("Pass!---------------------------------------------------\n");
    count++;
  }
  
    //test example
    printf("\n\ntest distance(): \n");
    float radius = distance(x1, y1, x2, y2);
    assert(radius == 5.00);
    printf("Pass!---------------------------------------------------\n");
 
    printf("\n\ntest circleArea(): \n");
    float area = circleArea(radius);
    assert((int)area == 78);
    printf("Pass!---------------------------------------------------\n");
    
    printf("\n\ntest perimeterOfTriangle(): \n");
    float perimeter = perimeterOfTriangle(x1, y1, x2, y2, x3, y3);
    assert((int)perimeter == 12);
    printf("Pass!---------------------------------------------------\n");
  
    
    return 0;
}

char scoreToLetter(int score) {
  switch (score) {
    case 60 ... 69:
      return 'D';
      break;
    case 70 ... 79:
      return 'C';
      break;
    case 80 ... 89:
      return 'B';
      break;
    case 90 ... 100:
      return 'A';
      break;
    default:
      if (score < 0 || score > 100) {
        return 'N';
      } else {
        return 'F';
      }
      break;
  }
}

float distance(float x1, float y1, float x2, float y2) {
  float distance = sqrt(pow(x1 - x2, 2)+pow(y1 - y2, 2));
  return distance;
}

float perimeterOfTriangle(float x1, float y1, float x2, float y2, float x3, float y3) {

  float perimeter = distance(x1, y1, x2, y2) + distance(x2, y2, x3, y3) + distance(x3, y3, x1, y1);

  return perimeter;
}

float circleArea(float radius) {

  float area = M_PI * pow(radius, 2);

  return area;
}