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While Loop in C

The while loop in C is used to repeatedly execute a block of code as long as a specified condition remains true. It is particularly useful when the number of iterations is not known beforehand.

Syntax of While Loop

while (condition) {
    // Code to execute while condition is true
}

Example: Counting from 1 to 5

#include <stdio.h>

int main() {
    int count = 1;
    while (count <= 5) {
        printf("Count: %d\n", count);
        count++;
    }
    return 0;
}

Output:

Count: 1
Count: 2
Count: 3
Count: 4
Count: 5

Code Explanation: The loop continues as long as count <= 5 is true. The variable count is incremented in each iteration.

Best Practices

  • Ensure that the loop condition will eventually become false to avoid infinite loops.
  • Initialize loop variables before entering the loop.
  • Keep the loop body concise and focused on a single task.

Don'ts

  • Don't forget to update the loop variable; failing to do so may cause an infinite loop.
  • Don't use floating-point variables for loop counters due to precision issues.
  • Don't modify the loop variable within the loop body in a way that makes the condition unpredictable.

    • Key Takeaways

    • The while loop is useful when the number of iterations is not predetermined.
    • Proper initialization and updating of the loop variable are crucial.
    • Always ensure the loop condition will eventually become false.
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