foreach
In this chapter you will learn:
- How to use foreach loop
- Use break with a foreach
- Use foreach on a two-dimensional array
- Search an array using foreach
Get to know foreach loop
foreach loop is for the enumerable
object. An array is an enumerable object.
The following code uses the foreach to print out the value for each element in an array.
The general form of foreach is shown here:
foreach(type var-name in collection)
statement;
using System;/*j ava 2 s. c o m*/
class Program
{
static void Main(string[] args)
{
int[] intArray = new int[] { 1, 2, 3, 4, 5, 6, 7, 8 };
foreach (int i in intArray)
{
Console.WriteLine(i);
}
}
}
The output:
Use break with a foreach
using System; //jav a 2 s .co m
class MainClass {
public static void Main() {
int sum = 0;
int[] nums = new int[10];
for(int i = 0; i < 10; i++)
nums[i] = i;
foreach(int x in nums) {
Console.WriteLine("Value is: " + x);
sum += x;
if(x == 4)
break; // stop the loop when 4 is obtained
}
Console.WriteLine("Summation of first 5 elements: " + sum);
}
}
The code above generates the following result.
Use foreach on a two-dimensional array
using System; //from j a v a2s . co m
class MainClass {
public static void Main() {
int sum = 0;
int[,] nums = new int[3,5];
for(int i = 0; i < 3; i++)
for(int j=0; j < 5; j++)
nums[i,j] = (i+1)*(j+1);
foreach(int x in nums) {
Console.WriteLine("Value is: " + x);
sum += x;
}
Console.WriteLine("Summation: " + sum);
}
}
The code above generates the following result.
Search an array using foreach
using System; /*from j a v a2 s .c o m*/
class MainClass {
public static void Main() {
int[] nums = new int[10];
int val;
bool found = false;
for(int i = 0; i < 10; i++)
nums[i] = i;
val = 5;
foreach(int x in nums) {
if(x == val) {
found = true;
break;
}
}
if(found)
Console.WriteLine("Value found!");
}
}
The code above generates the following result.
Next chapter...
What you will learn in the next chapter:
- Get to know the syntax of switch statement
- Group case statements together
- Empty cases can fall through