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C# Get Percentage From Number With Format String
Handle percentages: get percentages from ratios with format strings.Percentages. These are often useful in programs. With the numbers 1 and 2, we can get a percentage of 50%. We display and process percentages with doubles.
Notes, methods. With these methods, we solve an annoying rounding problem. Percentages can often be used to improve displayed values for users.Double
First example. We use string.Format to display 2 numbers or ratio as a percentage. The 3 methods all handle percentages. But their logic is implemented in different ways.
Note: DisplayPercentage accepts a double that is a ratio. The {0:0.0%} indicates a percentage with 1 digit past the decimal place.
Note 2: The second DisplayPercentage accepts 2 parameters and then passes the ratio of them to the other method. It casts to double.
CastsAlso: GetPercentageString accepts a double containing a ratio and returns a percentage string using ToString().
ToStringC# program that calculates per cents
using System;
class Program
{
static void Main()
{
// Display percentage of visits that resulted in purchases.
int purchases = 10;
int visitors = 120;
DisplayPercentage((double)purchases / visitors);
// Display 50 percent with overloaded method.
DisplayPercentage(1, 2);
// Write percentage string of nine tenths.
Console.WriteLine(GetPercentageString((double)9 / 10));
}
/// <summary>
/// This method writes the percentage form of a double to the console.
/// </summary>
static void DisplayPercentage(double ratio)
{
string percentage = string.Format("Percentage is {0:0.0%}", ratio);
Console.WriteLine(percentage);
}
/// <summary>
/// This method writes the percentage of the top number to the bottom number.
/// </summary>
static void DisplayPercentage(int top, int bottom)
{
DisplayPercentage((double)top / bottom);
}
/// <summary>
/// This method returns the percentage-formatted string.
/// </summary>
static string GetPercentageString(double ratio)
{
return ratio.ToString("0.0%");
}
}
Output
Percentage is 8.3%
Percentage is 50.0%
90.0%
Example 2. Here we convert 2 integers into a percentage manually with division and multiplication. Sometimes you can need raw percentages.
Cast: The double must be assigned to a value cast to double. If you omit the cast, your value will be rounded and probably useless.
Tip: When casting to double, you do not need to surround the entire expression with parentheses.
DivideInfo: Math.Floor rounds down to the nearest integer. Math.Ceiling rounds up to the nearest integer.
Math.FloorMath.CeilingMath.RoundC# program that converts ratios
using System;
class Program
{
static void Main()
{
// We want to have 92.9% from these two numbers.
int valid = 92;
int total = 99;
// First multiply top by 100 then divide.
double percent = (double)(valid * 100) / total; // <-- Use cast
// This is the percent number.
Console.WriteLine(percent);
Console.WriteLine(Math.Floor(percent));
Console.WriteLine(Math.Ceiling(percent));
Console.WriteLine(Math.Round(percent, 1));
}
}
Output
92.9292929292929
92
93
92.9
Modulo. The percentage sign in the C# language has a use as the modulo operator. This forms an expression that will return the remainder of a division of the 2 operands.Modulo
Tip: With modulo division, we can run an operation every N times. This has uses in many programs.
A summary. First we saw how to format ratios as percentages with 3 different methods. Second, we saw how to get a percentage value directly with math, and then round it.
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- C# Remove HTML Tags
- C# Remove String
- C# Reserved Filenames
- C# return Keyword
- C# Reverse String
- C# Reverse Words
- C# Reverse Extension Method
- C# RichTextBox Example
- C# Right String Part
- C# RNGCryptoServiceProvider Example
- C# ROT13 Method, Char Lookup Table
- C# SelectMany Example: LINQ
- C# Sentinel Optimization
- C# SequenceEqual Method (If Two Arrays Are Equal)
- C# Shift Operators (Bitwise)
- C# Short and ushort Types
- C# Single Method: Get Element If Only One Matches
- C# SingleOrDefault
- C# Singleton Pattern Versus Static Class
- C# Singleton Class
- C# sizeof Keyword
- C# Skip and SkipWhile Examples
- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression