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cs:c_language:while_cycle_1 [2019/02/26 14:35] (current)
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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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