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For loop is a control flow statement in programming that allows you to execute a block of code repeatedly based on a specified condition. It is commonly used when you know how many times you want to execute a block of code.
 For loop Syntax The syntax of For loop varies slightly depending on the programming language, but the basic structure is similar across many languages.
for (initialization; condition; update) {
// Code block to be executed repeatedly as long as the condition is true
}
Here’s a general overview of the Syntax of For loop:
- Initialization: This is where you initialize the loop control variable. This variable is typically used to keep track of the current iteration of the loop.
- Condition: This is the condition that is evaluated before each iteration of the loop. If the condition is true, the loop continues; otherwise, it terminates.
- Update: This is where you update the loop control variable. Typically, you increment or decrement the variable to ensure progress toward the loop termination condition.
For loop Syntax in C/C++:
Syntax:
for (initialization; condition; update) {
// Code block to be executed repeatedly as long as the condition is true
}
Explanation of the Syntax:
- In C and C++, the
for loop is initialized with an initial condition, followed by a loop condition, and an increment or decrement operation.
- The loop first executes the initialization part, typically used to initialize loop control variables.
- It then evaluates the condition specified in the loop header.
- If the condition is true, the code block within the curly braces
{} is executed.
- After executing the code block, the loop performs the increment or decrement operation.
- The loop then returns to the loop header and re-evaluates the condition. If the condition remains true, the process continues; otherwise, the loop terminates.
Implementation of For loop Syntax in C/C++:
C++
#include <iostream>
using namespace std;
int main()
{
for (int i = 0; i < 10; i++) {
cout << i << " ";
}
return 0;
}
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C
#include <stdio.h>
int main()
{
for (int i = 0; i < 10; i++) {
printf("%d ", i);
}
return 0;
}
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Output
0 1 2 3 4 5 6 7 8 9
For loop Syntax in Java:
Syntax:
for (initialization; condition; update) {
// Code block to be executed repeatedly as long as the condition is true
}
Explanation of the Syntax:
- In Java, the
for loop operates similarly to C and C++.
- It begins with an initialization expression, followed by a loop condition, and an increment or decrement operation.
- The loop first executes the initialization part.
- It then evaluates the condition specified in the loop header.
- If the condition is true, the code block within the curly braces
{} is executed.
- After executing the code block, the loop performs the increment or decrement operation.
- The loop returns to the loop header and re-evaluates the condition. If the condition remains true, the process continues; otherwise, the loop terminates.
Implementation of For loop Syntax in Java:
Java
import java.io.*;
class GFG
{
public static void main(String[] args)
{
for (int i = 0; i < 10; i++) {
System.out.print(i + " ");
}
}
}
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Output
0 1 2 3 4 5 6 7 8 9
For loop Syntax Python:
Syntax:
for variable in iterable:
# Code block to be executed repeatedly for each element in the iterable
Explanation of the Syntax:
- Python’s
for loop iterates over the elements of an iterable object, such as lists, tuples, strings, etc.
- It assigns each element of the iterable to the specified variable and executes the code block for each element.
- The loop continues until all elements of the iterable have been processed.
Implementation of For loop Syntax in Python:
Python3
for i in range(10):
print(i, end=" ")
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Output
0 1 2 3 4 5 6 7 8 9
For loop Syntax in C#:
Syntax:
for (initialization; condition; update) {
// Code block to be executed repeatedly as long as the condition is true
}
Explanation of the Syntax:
- In C#, the
for loop behaves similarly to C, C++, and Java.
- It starts with an initialization expression, followed by a loop condition, and an increment or decrement operation.
- The loop first executes the initialization part.
- It then evaluates the condition specified in the loop header.
- If the condition is true, the code block within the curly braces
{} is executed.
- After executing the code block, the loop performs the increment or decrement operation.
- The loop returns to the loop header and re-evaluates the condition. If the condition remains true, the process continues; otherwise, the loop terminates.
Implementation of For loop Syntax in C#:
C#
using System;
public class GFG {
static public void Main()
{
for (int i = 0; i < 10; i++) {
Console.Write(i + " ");
}
}
}
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Output
0 1 2 3 4 5 6 7 8 9
JavaScript (JS) For loop Syntax:
Syntax:
for (initialization; condition; update) {
// Code block to be executed repeatedly as long as the condition is true
}
Explanation of the Syntax:
- JavaScript’s
for loop operates similarly to other languages.
- It consists of an initialization expression, a loop condition, and an increment or decrement operation.
- The loop first executes the initialization part.
- It then evaluates the condition specified in the loop header.
- If the condition is true, the code block within the curly braces
{} is executed.
- After executing the code block, the loop performs the increment or decrement operation.
- The loop returns to the loop header and re-evaluates the condition. If the condition remains true, the process continues; otherwise, the loop terminates.
Implementation of For loop Syntax in JavaScript:
Javascript
for (let i = 0; i < 10; i++) {
console.log(i + " ");
}
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Output
0
1
2
3
4
5
6
7
8
9
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