So in the case of iterating though a zero-based array: for (int i = 0; i <= array.Length - 1; ++i) And if you're just looping, not iterating through an array, counting from 1 to 7 is pretty intuitive: Even ignoring minor differences in syntax there are many differences in how these statements work and the level of expressiveness they support. Generally, for-loops fall into one of the following categories: 6. But there's more here: Table is fast because of auto-compilation. Exit the loop. My preference is for the literal numbers to clearly show what values "i" will take in the loop. The results below show that a for loop runs faster overall compared to a foreach loop. The second conditional statement i < 3 checks whether the value of i is less than 3 or not, and if it is then it exits the loop. A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.. Syntax. Element Retrieving: A for loop can be used to retrieve a particular set of elements. It’s a useful habit to get into. $\begingroup$ @murray In general, you are right: one of the things the benchmark shows is the performance of the looping construct itself, as i^2 is so fast. In more typical uses it is the speed of looping that is negligible compared to the loop body. The foreach loop is a control structure for traversing items in an array or a collection. Example explained. The fact that i++ returns 0 is utterly meaningless. i gets incremented by 1, so the new value of i is used on the next iteration of the for loop. For loop illustration, from i=0 to i=2, resulting in data1=200. I wanted to find out if a for loop or a foreach loop is faster. The third statement i++ increases the value of i by 1. for(int i=0; i<10; ++i) { } Most of the time it is an integer, and it has no benefit. Statement 1 sets a variable before the loop starts (int i = 0).Statement 2 defines the condition for the loop to run (i must be less than 5).If the condition is true, the loop will start over again, if it is false, the loop will end.. In the init statement, the value i is created and set to zero. All for loops can be written as while loops, and vice-versa. i is less than 40, so the test evaluates as true. The syntax of a for loop in C programming language is −. The lower the dot on the screen, the faster the operation time. The variable "i" below is always used as the loop counter. for Loop vs foreach Loop: The for loop is a control structure for specifying iteration that allows code to be repeatedly executed. Thus, the above loop will execute the block three times, until the value of i becomes 3. Notice how each language captures the "semantics" of a for loop (the meaning) but each has slightly different syntaxes. Just use whichever loop seems more appropriate to the task at hand. The for loop is not like a function, where i gets passed into it. The for loop above takes 3 statements within it: let i = 0, which executes before the loop starts; i < 5, which is the condition for running the block of code within your loop; i++, which runs after each iteration of your loop; The result of those three statements is that the for loop executes the code within it, … I always use ++i. That value for i is not used at all. In the first example above, the for structure is executed 40 times. In the above example, the first statement let i = 0 declares and initializes a variable. In a for loop, i++ and ++i shouldn't make a difference. A for-loop statement is available in most imperative programming languages. Here's the code I used to time the operations: for ( init; condition; increment ) { statement(s); } Here is the flow of control in a 'for' loop − The init step is executed first, and only once. 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