how does c's for loop work code example

Example 1: for loop c

for(int i = 0; i<n ;i++) //i is the number of iterations that occur
{						 //n is the total number of iterations
 //code here
}

Example 2: for loop in c

//Sample for loop in c
//Prints the contents of the array in new lines
#include <stdio.h>
int main(){
	int a, b[5] = {2, 4, 5, 7, 9};
  for (a = 0; a<5; a++){
    printf("%d\n", b[a]);
  }
  
      
}