/* Name: Garrett Haldrup
lab6.c
Problem: Runs a loop letting a user decide which of the 4 programs to run until they are done.
Certification of Authenticity:
I certify that this assignment is entirely my own work.
*/

#include <stdio.h>
#include <ctype.h>

void scoreToLetter();
void ageInfo();
void digit2word();
void simpleCalculator();

int main() {
  char select, rerun;
  while (1) {

    // Display Selection Info
    printf("Select one program:\n");
    printf("- A: scoreToLetter\n");
    printf("- B: ageInfo\n");
    printf("- C: digit2word\n");
    printf("- D: simpleCalculator\n");
    printf("Enter selction: ");
    scanf("%c", &select);
    printf("\n");

    // Standardize char selection
    select = toupper(select);

    // Based on selection run a program
    switch (select) {
      case 'A':
        scoreToLetter();
        break;
      case 'B':
        ageInfo();
        break;
      case 'C':
        digit2word();
        break;
      case 'D':
        simpleCalculator();
        break;
    }
    // Clear input buffer
    while (getchar() != '\n');

    // See if the user wants to continue the loop
    printf("\nRun another? (y/n): ");
    scanf("%c", &rerun);


    // Standardize char for rerun ask
    rerun = tolower(rerun);

    if (rerun == 'n') {
      break;
    }

    // Clear input buffer
    while (getchar() != '\n');

    printf("\n");


  }


  return 0;
}

void scoreToLetter() {
  // Purpose
  printf("This program will take a numerical score and convert it to a letter grade.\n");
  // Dclare int
  int score;
  // Take input
  printf("Enter your score(0-100): ");
  scanf("%d", &score);
  // Switch Case and print grade
  switch (score) {
    case 90 ... 100:
      printf("A\n");
      break;
    case 80 ... 89:
      printf("B\n");
      break;
    case 70 ... 79:
      printf("C\n");
      break;
    case 60 ... 69:
      printf("D\n");
      break;
    case 0 ... 59:
      printf("F\n");
      break;
    default:
      printf("Must be really bad or really good :)\n");
  }
}

void ageInfo() {
  // Purpose
  printf("This program will take your age and say what you cant and can do\n\n");
  // Declare age
  int age;
  // Take Input
  printf("Enter your age: ");
  scanf("%d", &age);

  // Compare age to see range
  if (age >= 18) {
    printf("Can vote\n");
    if (age >= 21) {
      printf("Can buy alcohol\n");
    } else {
      printf("Not old enoguth to buy alcohol\n");
    }
  } else {
    printf("Not old enough to vote\n");
  }
  
}

void digit2word() {
  // Purpose
  printf("This program will take a digit (0-9) and convert it to a word.\n\n");
  
  // Declare int variable
  int num;

  // Ask for input number
  printf("Enter a number(0-9): ");
  scanf("%d", &num);

  // Swtich case the numbers
  switch(num) {
    case 0:
      printf("Zero");
      break;
    case 1:
      printf("One");
      break;
    case 2:
      printf("Two");
      break;
    case 3:
      printf("Three");
      break;
    case 4:
      printf("Four");
      break;
    case 5:
      printf("Five");
      break;
    case 6:
      printf("Six");
      break;
    case 7:
      printf("Seven");
      break;
    case 8:
      printf("Eight");
      break;
    case 9:
      printf("Nine");
      break;
  }

  
}

void simpleCalculator() {
  // Purpose
  printf("This program will take float inputs and an operand and display the calculation!\n\n");
  // Declare floats and char
  float num1, num2, answer;
  char operand;

  // Ask 2 floats and operand
  printf("Enter float number 1: ");
  scanf("%f", &num1);

  while (1) {
    printf("Enter your operand('-', '+', '*', '/'): ");
    // Clear Buffer
    while (getchar() != '\n');
    scanf("%c", &operand);
    if (!(operand == '-' || operand == '+' || operand == '*' || operand == '/')) {
      printf("Not a valid opperand! Please try again!\n");
      continue;
    }
    break;
  }

  // Check if dividing by 0
  while (1) {
    printf("Enter float number 2: ");
    scanf("%f", &num2);
    if (operand == '/' && !num2) {
      printf("Cannot divide by 0! Please try again!\n");
      continue;
 
   }
    break;
  }
  // Compute
  switch (operand) {
    case '-':
      answer = num1 - num2;
      break;
    case '+':
      answer = num1 + num2;
      break;
    case '*':
      answer = num1 * num2;
      break;
    case '/':
      answer = num1 / num2;
      break;
  }
  // Display output
  printf("%.1f %c %.1f = %.2f", num1, operand, num2, answer);
}