Logical Operators on String in C#

CsharpProgrammingServer Side Programming

The following are the logical operators that you can use on Strings in C#.

OperatorDescriptionExample
&&Called Logical AND operator. If both the operands are non zero then condition becomes true.(A && B) is false.
||Called Logical OR Operator. If any of the two operands is non zero then condition becomes true.(A || B) is true.
!Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.!(A && B) is true.

Let us see an example showing how to use logical AND operator on strings −

Example

Live Demo

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class Demo {
public bool CheckUnique(string str) {
string one = "";
string two = "";
for (int i = 0; i < str.Length; i++) {
one = str.Substring(i, 1);
for (int j = 0; j < str.Length; j++) {
two = str.Substring(j, 1);
if ((one == two) && (i != j))
return false;
}
}
return true;
}
static void Main(string[] args) {
Demo d = new Demo();
bool b = d.CheckUnique("amit");
Console.WriteLine(b);
}
True