Assign4 and lab4

csci218/Assignments/BMI.c

@@ -1,31 +1,70 @@
 #include <stdio.h>
 #include <math.h>
 #include <string.h>
+#include <ctype.h>
 
 int main(){
 
   // Declare Variables
+  // Float values for calculations
   float bmi, weight, height, mostellar, duBois, boyd, lifeExpect;
-  char gender[15];
+
+  // Int values to store the result of the scanf fucntion
+  int weightResult, heightResult;
+
+  // Char to store the gender with max length of 7 and a line string for formatting
+  char gender[7];
   char line[] = "********************************";
+
   // Display Program Purpose
-  printf("%s%s%s\n", line, line, line);
-  printf("This program will calculate your BMI, Life Expectancy, and BSA(mulitple methods)\nwith just your weight(kg), height(cm), and gender.\n");
-  printf("%s%s%s\n", line, line, line);
+  printf("%s%s%s*\n", line, line, line);
+  printf("*\tThis program will calculate your BMI, Life Expectancy, and BSA(mulitple methods)\t*\n");
+  printf("*\twith just your weight(kg), height(cm), and gender.\t\t\t\t\t*\n");
+  printf("%s%s%s*\n", line, line, line);
+
   // Read in weight, height, and gender from user
   printf("Please enter your weight(kg): ");
-  scanf("%f", &weight);
+  weightResult = scanf("%f", &weight);
+  while (weight <= 0 || weightResult != 1) {
+    while (getchar() != '\n');
+    if (weight <= 0) {
+      printf("Bad Value: Weight must greater than 0! fmt: XX.X\n");
+    } else {
+      printf("Bad Value: Please enter a decimal input! fmt: XX.X\n");
+    }
+    printf("Please re-enter your weight(kg): ");
+    weightResult = scanf("%f", &weight);
+  }
+
   printf("Please enter your height(cm): ");
-  scanf("%f", &height);
+  heightResult = scanf("%f", &height);
+  while (height <= 0 || heightResult != 1) {
+    while (getchar() != '\n');
+    if (height <= 0) {
+      printf("Bad Value: Height must greater than 0! fmt: XX.X\n");
+    } else {
+      printf("Bad Value: Please enter a decimal input! fmt: XX.X\n");
+    }
+    printf("Please re-enter your height(cm): ");
+    heightResult = scanf("%f", &height);
+  }
     
   // Make sure correct values for gender are entered
   while (1) {
+    // Read in gender from user
     printf("Please enter your gender(male or female): ");
     scanf("%s", gender);
-    if (strcmp("male", gender) == 0 || strcmp("female", gender) ==  0) {
+    
+    // Loop through all chars in gender and convert to lower case
+    for (int i = 0; i < strlen(gender); i++) {
+      gender[i] = tolower(gender[i]);
+    }
+
+    // Check if gender is valid
+    if (!(strcmp("male", gender)) || !(strcmp("female", gender))) {
       break; 
     } else {
-      printf("Bad value: Please enter either male or female all lowercase\n");
+      printf("Bad value: Please enter either male or female\n");
     }
   }
   
@@ -43,6 +82,7 @@ int main(){
   boyd = (0.0003207 * pow(height, 0.3)) * pow((1000 * weight), (0.6721 - (0.0188 * log10(weight))));
 
   // Check if overweight and gender to select correct life expectancy message
+  // Only need to check one since the input screens to just two options
   if (strcmp("male", gender)) {
     if (bmi > 25) {
       lifeExpect = 81.4;