Loop | C# By Examples

The while statement first checks the condition to determine whether to repeat the loop.

There is also the do ~ while syntax that first executes the code and then checks the condition.

int count = 0;
while (count < 5) {
    Console.WriteLine(count);
    count++;
}

$ dotnet run
0
1
2
3
4

for loop is an statement that repeats the code while the condition is true.

for (int i = 0; i < 5; i++) {
    Console.WriteLine(i);
}

Like C++, if there are no parentheses, the next line of code is recognized as the body of the for statement.

for (int i = 0; i < 5; i++) 
    Console.WriteLine(i);
Console.WriteLine("End");

$ dotnet run
0
1
2
3
4
End

This example prints the alphabet from a to z.

// output: abcdefghijklmnopqrstuvwxyz
for (char c = 'a'; c <= 'z'; c++) {
    Console.Write(c);
}

The foreach statement is used to iterate over all elements of an array or list.

string[] foods = new string[3]{"🍕", "🌭", "🥪"};
foreach (string f in foods) {
    Console.WriteLine(f);
}

$ dotnet run
🍕
🌭
🥪

Loop #