- C++ Programming Examples
- C++ Programming Examples
- C++ Hello World
- C++ Get Input
- C++ Print Integer
- C++ Add Two Numbers
- C++ Add Sub Mul Div
- C++ Add Digits
- C++ Find Average Perc
- C++ Find Arithmetic Mean
- C++ Sum of n Natural Numbers
- C++ Sum of n Numbers
- C++ Area Perimeter of Square
- C++ Area Perimeter of Rectangle
- C++ Area Perimeter of Triangle
- C++ Area Circum of Circle
- C++ Find Simple Interest
- C++ Fahrenheit to Celsius
- C++ Celsius to Fahrenheit
- C++ Print Prime Numbers
- C++ Reverse a Number
- C++ Swap Two Numbers
- C++ Print Multiplication Table
- C++ Find Factorial of Number
- C++ Find Factors of Number
- C++ Find HCF & LCM
- C++ Make Calculator
- C++ Count Digits in Number
- C++ Sum of First & Last Digit
- C++ Product of Digits of Number
- C++ Sum of Squares of Digits
- C++ Interchange Digits of Number
- C++ if else Programs
- C++ Check Even or Odd
- C++ Check Prime or Not
- C++ Check Alphabet or Not
- C++ Check Vowel or Not
- C++ Check Leap Year or Not
- Check Reverse equal Original
- C++ Check Perfect Number
- C++ Check Palindrome or Not
- C++ Check Armstrong or Not
- C++ Divisibility Test
- C++ Find Wage of Labor
- C++ Find Discounted Price
- C++ Find Shipping Charge
- C++ Find Telephone Bills
- C++ Calculate Student Grade
- C++ Largest of Two Numbers
- C++ Largest of Three Numbers
- C++ Number Conversion
- C++ Decimal to Binary
- C++ Decimal to Octal
- C++ Decimal to Hexadecimal
- C++ Binary to Decimal
- C++ Binary to Octal
- C++ Binary to Hexadecimal
- C++ Octal to Decimal
- C++ Octal to Binary
- C++ Octal to Hexadecimal
- C++ Hexadecimal to Decimal
- C++ Hexadecimal to Binary
- C++ Hexadecimal to Octal
- C++ Pattern Programs
- C++ Pattern Programs
- C++ Print Diamond Pattern
- C++ Print Floyd's Triangle
- C++ Print Pascal's Triangle
- C++ Array Programs
- C++ 1D Array Program
- C++ Linear Search
- C++ Binary Search
- Find Largest Element in Array
- Find Smallest Element in Array
- Find Second Largest Element
- Find Second Smallest Element
- C++ Sum of All Elements
- C++ Multiply All Elements
- C++ Element on Even Position
- C++ Element on Odd Position
- C++ Print Even Numbers in Array
- C++ Print Odd Numbers in Array
- C++ Count Even/Odd Numbers
- C++ Sum of Even/Odd Numbers
- C++ Count Positive Negative Zero
- C++ Reverse an Array
- C++ Insert Element in Array
- C++ Delete Element from Array
- C++ Merge two Arrays
- C++ Bubble Sort
- C++ Selection Sort
- C++ Insertion Sort
- C++ Common Elements
- C++ 2D Array Programs
- C++ Add Two Matrices
- C++ Subtract Two Matrices
- C++ Transpose Matrix
- C++ Multiply Two Matrices
- C++ 3D Array Programs
- C++ String Programs
- C++ Print String
- C++ Find Length of String
- C++ Compare Two Strings
- C++ Copy String
- C++ Concatenate String
- C++ Reverse a String
- C++ Delete Vowels from String
- C++ Delete Word from String
- C++ Count Character in String
- C++ Count Word in String
- C++ Frequency of Word
- C++ Remove Spaces from String
- C++ Sort a String
- C++ Uppercase to Lowercase
- C++ Lowercase to Uppercase
- C++ Swap Two Strings
- C++ Check Anagram or Not
- C++ Capitalize All Words in String
- C++ Capitalize Specific Character
- C++ Get Numbers from String
- C++ File Programs
- C++ Read a File
- C++ Write Content to File
- C++ Append Data in File
- C++ Read & Display File
- C++ Copy a File
- C++ Merge Two Files
- Count Characters, Words in File
- C++ Capitalize All Words in File
- C++ List Files in Directory
- C++ Delete a File
- C++ Encrypt & Decrypt a File
- C++ Misc Programs
- C++ Print ASCII Value
- C++ Add Binary Numbers
- C++ Generate Random Numbers
- C++ Print Smiling Face
- C++ Days into Years, Months
- Add Two Numbers using Pointer
- C++ Print Fibonacci Series
- Generate Armstrong Numbers
- C++ Find nCr and nPr
- C++ Get IP Address
- C++ Print Date/Time
- C++ Shutdown, Restart Computer
- C++ Programming Tutorial
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C++ Program to Find Largest of Three Numbers
In this article, you will learn and get code to find and print largest of entered three numbers by user at run-time in C++. The program is created in following ways:
- Find largest of three numbers without function
- Find largest of three numbers using user-defined Function
Both program uses if-else, to find and print largest or biggest among any three numbers entered by user.
Find Largest of Three Numbers in C++
To find the largest number among three numbers in C++ programming, you have to ask from user to enter the three numbers. Now use if-else ladder to find out the largest among three as shown in the program given below:
The question is, write a program in C++ that finds largest of three numbers. Here is its answer:
#include<iostream> using namespace std; int main() { int numOne, numTwo, numThree, larg; cout<<"Enter the Three Numbers: "; cin>>numOne>>numTwo>>numThree; if(numOne>numTwo) { if(numTwo>numThree) larg = numOne; else { if(numThree>numOne) larg = numThree; else larg = numOne; } } else { if(numTwo>numThree) larg = numTwo; else larg = numThree; } cout<<"\nLargest Number = "<<larg; cout<<endl; return 0; }
This program was build and run under Code::Blocks IDE. Here is its sample run:
Now supply any three numbers as input say 1, 2, 3. Here the third number is largest and second number
is second largest. Press ENTER
key to print the largest among these three numbers as shown in the
output given below:
Here is another sample run with user input 1, 3, 2. Here the second number is largest and third number is second largest:
Here is the one more sample run with user input, 3, 1, 2:
Main Logic of Previous Program
The main logic behind the code is:
- Initially checks whether the first number is greater than second:
- If first number is greater than second, then checks whether second number
is greater than third:
- If it is true. Then first number is greater than second and second number is greater than third
- So the first number is the largest number
- And if second number is not greater than third, means that, the third number is greater than second
- Because third number is greater than second, so checks whether the third
number is also greater than first:
- If it is true. Then third number is greater than first and second both
- So the third number is the largest number
- And if third number is not greater than first, means that, the first number is greater than third
- Because first number is greater than third and second both
- So first number is the largest number
- If first number is greater than second, then checks whether second number
is greater than third:
- If first number does not greater than second, then second number is greater
than first:
- Because second number is greater than first, therefore checked whether
the second number is also greater than third:
- If it is true. Then second number is greater than first and third both
- So second number is the largest
- And if second number is not greater than third, means that, third number is greater than second
- Because third number is greater than second, and second number is greater than first
- So third number is the largest
- Because second number is greater than first, therefore checked whether
the second number is also greater than third:
Previous Program Explained with Dry Run
The dry run of above program with user input 2, 1, 3 goes like:
- When user enters 2, 1, 3 in same pattern, then 2 gets stored in numOne, 1 gets stored in numTwo, and 3 gets stored in numThree. That is, numOne=2, numTwo=1, and numThree=3
- Now the condition, numOne>numTwo or 2>1 evaluates to be true, threfore program flow goes inside the if block
- Now the condition, numTwo>numThree or 1>3 evaluates to be false, therefore program flow does not goes inside if's body, rather it goes to its else's part
- And there, the condition numThree>numOne or 3>2 evaluates to be true, therefore program flow goes inside the if's body
- And the value of numThree gets initialized to larg
- Because the condition evaluates to be true, therefore program flow skip else's part
- And for outermost if-else, because the condition of if evaluates to be true, therefore again in this case also, else's part gets skipped
- So program flow goes to the statement that prints the value of larg as output
- That will print the largest among entered three numbers
Find Largest of three Numbers using Function
This program does the same job as of previous program. But internally this program uses a different approach to do the task. That is, this program is created using a user defined function, findLargest()
The function, findLargest() takes three numbers as its arguments, and returns the largest among its three argument. So the largest number gets returned by this function and initialized to larg inside the main() function. Therefore just print the value of larg
#include<iostream> using namespace std; int findLargest(int, int, int); int main() { int numOne, numTwo, numThree, larg; cout<<"Enter the Three Numbers: "; cin>>numOne>>numTwo>>numThree; larg = findLargest(numOne, numTwo, numThree); cout<<"\nLargest Number = "<<larg; cout<<endl; return 0; } int findLargest(int nOne, int nTwo, int nThree) { if(nOne>nTwo) { if(nTwo>nThree) return nOne; else { if(nThree>nOne) return nThree; else return nOne; } } else { if(nTwo>nThree) return nTwo; else return nThree; } }
This program produces the same output as of previous program.
Same Program in Other Languages
- C Find Largest of three Numbers
- Java Find Largest of three Numbers
- Python Find Largest of three Numbers
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