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+====== while cycle (Example 1) ======
+**Concepts:**\\
+//While// cycle, //if// instruction, module operator (%)
+**Text:**\\
+Implement a C program that:
+  * acquires 5 number from the keybord
+  * computes how many even and odd numbers are inserted
+  * prints the results of this computation
+**Solution:**\\
+<file C while_cycle_1.c>
+/* Insert 5 numbers using the keyboard and count how many even and odd numbers have been inserted */
+#include <stdio.h>
+#define NUMBERS 5
+int main(){
+  int n;
+  int x;
+  int n_even, n_odd;
+  n=0;
+  n_even=0;
+  n_odd=0;
+  while(n<NUMBERS){
+    printf("Insert number %d: ", n);
+    scanf("%d", &x);
+    if (x%2 == 0) {
+      printf("Even!\n");
+      n_even = n_even+1;
+    }else{
+      printf("Odd!\n");
+      n_odd = n_odd+1;
+    }
+     n = n+1;
+  }
+  printf("EVEN: %d - ODD: %d\n", n_even, n_odd);
+  return 0;
+}
+</file>
+**Comments:**\\
+The program executes 5 times the block of code inside the //while// cycle that:
+  * asks the user to insert a number
+  <code c>
+  scanf("%d", &x);
+  </code>
+  * checks if the number is even //if (x%2 == 0)// or odd (branch //else// of the //if// instruction)
+  <code c>
+  if (x%2 == 0) {
+      /* Code executed if x is even */
+  }else{
+      /* Code executed if x is odd */
+  }
+  </code>
+  * in the case of an even, it increments the variable //n_even//, otherwise, in the case of an odd number, it increments the variable //n_odd//
+  * at the ends of the //while// cycle the program prints the results
+  <code c>
+  printf("EVEN: %d - ODD: %d\n", n_even, n_odd);
+  </code>

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