Add BMI Calculator code

bmi-calculator/README.md

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+# Body Mass Index (BMI) Calculator
+
+Determine wether you're Underweight, Normal weight, Overweight, Obesity, or Over Obesity based on your body mass index, which is calculated by using weight and height.

bmi-calculator/bmi-calculator.cpp

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+/*###################################################
+  #                                                 #
+  #   Body Mass Index (BMI) Calculator              #
+  #   Copyright (c) 2008 - 2018 Junian Triajianto   #
+  #                                                 #
+  ###################################################*/
+
+#include <cstdio>
+#include <cstdlib>
+
+char toUpper(char x);
+
+int main() {
+  char r;
+  do {
+    float TB, IMT;
+    int BB;
+    printf("Body Mass Index (BMI) Calculator\n");
+    printf("================================\n\n");
+    printf("BW   : Weight (kg)\n");
+    printf("BH   : Height (m)\n");
+    printf("BMI  : Body Mass Index\n\n");
+    printf("BW   : ");
+    scanf("%d", & BB);
+    printf("BH   : ");
+    scanf("%f", & TB);
+    IMT = BB / (TB * TB);
+    printf("BMI  : %0.2f\n\n", IMT);
+    printf("You are ");
+    if (IMT < 18.5)
+      printf("Underweight");
+    else if (IMT < 23)
+      printf("Normal weight");
+    else if (IMT < 25)
+      printf("Overweight");
+    else if (IMT < 30)
+      printf("Obesity");
+    else
+      printf("Over Obesity");
+    printf("\n\nTry again [Y/N]? ");
+    do {
+      r = getchar();
+      r = toUpper(r);
+    } while (r != 'Y' && r != 'N');
+  } while (r == 'Y');
+  return 0;
+}
+
+char toUpper(char x) {
+  if (x >= 97 && x <= 122) x = x - 32;
+  return x;
+}