Review

.gitignore

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+area
+hello

burgerDiscount.c

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+/*
+Purpose: to calculate the price of burger purchases including a discount.
+concepts: if, else if, else
+*/
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+  char burgerSoldChar[100];
+  int burgerSold;
+  int burgerTotal, discount;
+  int finalPrice;
+  const int zero_discount = 19,
+            ten_discount = 20,
+            twentyFive_discount = 50,
+            fifty_discount = 75,
+            seventyFive_Discount = 100,
+            burgerPrice = 8;
+  printf("Enter # of burgers sold: ");
+  gets (burgerSoldChar);
+  burgerSold = atoi(burgerSoldChar);
+
+  // rules to calculate discount prices
+  if (burgerSold >= 1)
+  {
+    if (burgerSold >= seventyFive_Discount)
+    {
+      burgerTotal = (burgerSold * burgerPrice);
+      discount = (burgerTotal) * (.75);
+      finalPrice = (burgerTotal - discount);
+
+      printf("# of burgers sold: %d \n", burgerSold);
+      printf("Final Price: $%d \n", burgerTotal);
+      printf("Discount $%d \n", discount);
+      printf("Final Price after Discount: $%d \n", finalPrice);
+    }
+    else if (burgerSold >= fifty_discount)
+    {
+      burgerTotal = (burgerSold * burgerPrice);
+      discount = (burgerTotal) * (.50);
+      finalPrice = (burgerTotal - discount);
+
+      printf("# of burgers sold: %d \n", burgerSold);
+      printf("Final Price: $%d \n", burgerTotal);
+      printf("Discount $%d \n", discount);
+      printf("Final Price after Discount: $%d \n", finalPrice);
+    }
+    else if (burgerSold >= twentyFive_discount)
+    {
+      burgerTotal = (burgerSold * burgerPrice);
+      discount = (burgerTotal) * (.25);
+      finalPrice = (burgerTotal - discount);
+
+      printf("# of burgers sold: %d \n", burgerSold);
+      printf("Final Price: $%d \n", burgerTotal);
+      printf("Discount $%d \n", discount);
+      printf("Final Price after Discount: $%d \n", finalPrice);
+    }
+    else if (burgerSold >= ten_discount)
+    {
+      burgerTotal = (burgerSold * burgerPrice);
+      discount = (burgerTotal) * (.10);
+      finalPrice = (burgerTotal - discount);
+
+      printf("# of burgers sold: %d \n", burgerSold);
+      printf("Final Price: $%d \n", burgerTotal);
+      printf("Discount $%d \n", discount);
+      printf("Final Price after Discount: $%d \n", finalPrice);
+    }
+    else
+    {
+      burgerTotal = (burgerSold * burgerPrice);
+
+      printf("# of burgers sold: %d \n", burgerSold);
+      printf("Final Price: $%d \n", burgerTotal);
+      printf("For a discount purchase 20 or more \n");
+    }
+  }
+  else
+  {
+    putchar('\n');
+    printf("Input is invalid. Run the program again and ");
+    printf("use a number bigger than zero. \n");
+  }
+
+  return 0;
+}

calculateArea.c

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+/*
+Purpose: to calculate the area of some geometric shapes.
+concepts: if, else, switch, break, do while
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+int main() {
+  int choice;
+  do {
+    char choiceStr[10], radiusStr[256], cont[256], widthStr[256], lengthStr[256],
+    lengthTriangleStr[256], heightStr[256];
+    double radius, width, length, lengthTriangle, height;
+    double circle_area, triangle_area, rectangle_area;
+    const double PI = 3.14159;
+
+    printf("1. Calculate the area of a circle \n");
+    printf("2. Calculate the area of a rectangle \n");
+    printf("3. Calculate the area of a Triangle \n");
+    printf("4. Quit \n\n");
+    printf("Enter you choice (1-4): ");
+
+    fgets(choiceStr, 10, stdin);
+    choice = atoi(choiceStr);
+
+    // input validation
+    while (choice < 1 || choice > 4) {
+      printf("ERROR!! \n");
+      printf("Enter a choice between 1-4 : ");
+      fgets(choiceStr, 10, stdin);
+      choice = atoi(choiceStr);
+    }
+
+    // if valid input
+    switch (choice) {
+    case 1:
+      printf("\nEnter the radius of the circle: ");
+      fgets(radiusStr, 256, stdin);
+      radius = atof(radiusStr);
+      while (radius < 0) {
+        printf("Error! \n");
+        printf("Enter a positive value for the radius: ");
+        fgets(radiusStr, 256, stdin);
+        radius = atoi(radiusStr);
+      }
+      if (radius > 0) {
+        circle_area = PI * radius * radius;
+        printf("\nThe area of the circle is: %.2f \n", circle_area);
+        printf("**********************************************\n\n");
+        printf("Calculate another area, or press (4) to quit\n\n");
+      }
+      break;
+
+    case 2:
+      printf("Enter the width of the rectangle: ");
+      fgets(widthStr, 256, stdin);
+      width = atof(widthStr);
+      while (width < 0) {
+        printf("Error!\n\n");
+        printf("Enter a positive value for the width: ");
+        fgets(widthStr, 256, stdin);
+        width = atof(widthStr);
+      }
+      printf("Enter the length of the rectangle: ");
+      fgets(lengthStr, 256, stdin);
+      length = atof(lengthStr);
+      while (length < 0) {
+        printf("Error!\n\n");
+        printf("Enter a positive value for the length: ");
+        fgets(lengthStr, 256, stdin);
+        length = atof(lengthStr);
+      }
+      if (width > 0 && length > 0) {
+        rectangle_area = width * length;
+        printf("\nThe area of the rectangle is: %.2f \n", rectangle_area);
+        printf("**********************************************\n\n");
+        printf("Calculate another area, or press (4) to quit\n\n");
+      }
+      break;
+    case 3:
+      printf("Enter the base of the triangle: ");
+      fgets(lengthTriangleStr, 256, stdin);
+      lengthTriangle = atof(lengthTriangleStr);
+      while (lengthTriangle < 0) {
+        printf("Error!\n\n");
+        printf("Enter a positive value for the base: ");
+        fgets(lengthTriangleStr, 256, stdin);
+        width = atof(lengthTriangleStr);
+      }
+      printf("Enter the height of the triangle: ");
+      fgets(heightStr, 256, stdin);
+      height = atof(heightStr);
+      while (heightStr < 0) {
+        printf("Error!\n\n");
+        printf("Enter a positive value for the height: ");
+        fgets(heightStr, 256, stdin);
+        height = atof(heightStr);
+      }
+      if (lengthTriangle > 0 && height > 0) {
+        triangle_area = lengthTriangle * height / 2;
+        printf("\nThe area of the triangle is: %.2f \n", triangle_area);
+        printf("**********************************************\n\n");
+        printf("Calculate another area, or press (4) to quit\n\n");
+      }
+      break;
+
+    case 4:
+      printf("program terminated \n");
+      break;
+    }
+  } while (choice != 4); //{
+}