For loop

Syntax

for (initialization; condition; final-expression) {
  // Loop Body
}

Parts of a for Loop

Initialization

• Executed only once at the beginning of the loop.
• Is typically used to initialize the loop counter: int i = 0; for example

Condition

• Checked before each iteration.
• If true, execute the body. If false, terminate the loop
• Often checks to ensure i is less than some value: i < 5; for example

Final-expression

• Executed after each iteration of the loop body.
• Can be used to update the loop counter or run any other code: i++ for example
• Loop Body
• The block of code that is executed while the condition is true.

Example: Basic Loop

#include <stdio.h>

int main() {
  for (int i = 0; i < 5; i++) {
    printf("%d\n", i);
  }
  return 0;
}

// Prints:
// 0
// 1
// 2
// 3
// 4

Example

#include <stdio.h>

void print_numbers(int start, int end) {
  for (; start <= end; start++) {
    printf("current_number: %d\n", start);
  }
}

int main() {
  print_numbers(10, 40);
  return 0;
}