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For Loop in C

The for loop in C is used to execute a block of code repeatedly for a known number of times. It is commonly used when the number of iterations is predetermined.

Syntax

for (initialization; condition; increment/decrement) { // Code to be executed repeatedly }

Example

for (int i = 1; i <= 5; i++) { printf("%d\n", i); } // Output: 1 2 3 4 5

How It Works

  • Initialization happens once at the beginning (e.g., int i = 1).
  • The condition is checked before every iteration; if true, the loop executes, if false, it terminates.
  • The increment/decrement step executes after each iteration.
  • The loop repeats until the condition becomes false.

Tips

  • Use for loops when the number of iterations is known in advance.
  • Keep loop body simple to avoid complexity.
  • Avoid modifying the loop counter inside the loop body unless intentional.
  • Use proper indentation to visualize the loop clearly.

Common Mistakes

  • Forgetting to increment/decrement the loop variable, causing an infinite loop.
  • Using the wrong condition, leading to zero iterations or infinite loops.
  • Declaring the loop variable outside when not needed or inside when it should be reused.
  • Modifying the loop variable inside the loop body unexpectedly, causing incorrect results.