Answers for "how to write a for loop"

javascript for loop

var colors=["red","blue","green"];
for (let i = 0; i < colors.length; i++) { 
  console.log(colors[i]);
}

for loop

// this is javascript, but can be used in any language 
// with minor modifications of variable definitions

let array = ["foo", "bar"]

let low = 0; // the index to start at
let high = array.length; // can also be a number

/* high can be a direct access too
	the first part will be executed when the loop starts 
    	for the first time
	the second part ("i < high") is the condition 
    	for it to loop over again.
    the third part will be executen every time the code 
        block in the loop is closed.
*/ 
for(let i = low; i < high; i++) { 
  // the variable i is the index, which is
  // the amount of times the loop has looped already
  console.log(i);
  console.log(array[i]); 
} // i will be incremented when this is hit.

// output: 
/*
	0
    foo
    1
    bar
*/

for loop

for (let i = 0; i < substr.length; ++i) {
    // do something with `substr[i]`
}

for loop

for i in range (some_number):
	#code goes here

for loop

for (int i = 1; i <= 10; i++) {
	printf("%d\n",i);
}

for loop

double serviceCharge = 0;  if (cost >= 150)  
{  
   serviceCharge = 0.15 * cost;  
}