Real-Life Examples of While Loops in C

Discover practical applications of while loops in C programming through real-life examples. This section includes a simple countdown program that demonstrates how while loops can be effectively utilized in various scenarios.

C While Loop Examples

Real-Life Examples

To illustrate a practical use of the while loop, we’ve created a simple countdown program:

int countdown = 4;

while (countdown > 0) {
  printf("%d\n", countdown);
  countdown--;
}

printf("Happy Anniversary!!\n");

In this next example, we create a program that prints only the even numbers from 0 to 20 (inclusive):

int i = 0;

while (i <= 20) {
  printf("%d\n", i);
  i += 2;
}

Next, we’ll use a while loop to reverse a set of digits:

// A variable containing specific digits
int numbers = 67890;

// A variable to hold the reversed number
int revNumbers = 0;

// Reverse the order of the digits
while (numbers) {
  // Extract the last digit from 'numbers' and add it to 'revNumbers'
  revNumbers = revNumbers * 10 + numbers % 10;
  // Remove the last digit from 'numbers'
  numbers /= 10;
}

Lastly, here’s a fun example of using a while loop in a Yatzy game:

int dice = 1;

while (dice <= 6) {
  if (dice < 6) {
    printf("No Yatzy\n");
  } else {
    printf("Yipee!\n");
  }
  dice++;
}

If the loop encounters values from 1 to 5, it outputs "No Yatzy". When it hits the value 6, it displays "Yipee!".