C++ Program to Find Largest Among Three Numbers
Last Updated :
02 Aug, 2023
There are many different methods using which we find the maximum or largest number among three numbers. In this article, we will learn three such methods to find the largest among three numbers in C++.
Example:
Input: a = 1, b = 2, c = 45
Output: The Largest Among 3 is 45
Methods to Find the Largest of Three Numbers
We can use the three methods to find the largest of the three numbers:
- Using if-else Statement.
- Using Temporary Variable
- Using In-built max() Function.
1. Using if-else Statements
Algorithm
- Start.
- Input a, b, and c.
- Check the condition a>=b
- If step 3 is True go to step 5 else go to step 9.
- Check the condition a>=c.
- If step 5 is True go to step 7 else go to step 8.
- Print “The Largest Among 3 is: a and go to step 13
- Print “The Largest Among 3 is: c and go to step 13.
- Check the condition b>=c.
- If step 9 is True go to step 11 else go to step 12.
- Print “The Largest Among 3 is: b and go to step 13.
- Print “The Largest Among 3 is: c and go to step 13.
- Stop.
C++ Program to Find the Largest Number using if-else.
C++
#include <bits/stdc++.h>
using namespace std;
int main()
{
int a, b, c;
cout << "Enter the three numbers a, b & c" << endl;
cin >> a >> b >> c;
if (a >= b) {
if (a >= c) {
cout << "The Largest Among Three Numbers is : "
<< a << endl;
}
else {
cout << "The Largest Among Three Numbers is : "
<< c << endl;
}
}
else {
if (b >= c) {
cout << "The Largest Among Three Numbers is : "
<< b << endl;
}
else {
cout << "The Largest Among Three Numbers is : "
<< c << endl;
}
}
return 0;
}
|
Output
Enter the three numbers a, b & c
The Largest Among Three Numbers is : 4196384
Complexity Analysis
- Time Complexity: O(1)
- Auxiliary Space: O(1)
2. Using Temporary Variable
It is one of the simplest methods where we take a new variable equal to any of the three numbers and assume it to be max. The algorithm for this method is as follows:
Algorithm
- Create a new variable named max = a.
- If max is less than b, then max = b.
- If max is less than c, then max = c.
- Return max.
C++ Program to Find the Largest Among Three Numbers Using Temporary Variable
C++
#include <bits/stdc++.h>
using namespace std;
int main()
{
int a = 1, b = 10, c = 4;
int max = a;
if (max < b)
max = b;
if (max < c)
max = c;
printf("%d is the maximum out of %d, %d, and %d", max,
a, b, c);
return 0;
}
|
Output
10 is the maximum out of 1, 10, and 4
Complexity Analysis
- Time Complexity: O(1)
- Auxiliary Space: O(1)
3. Find the Largest Number Using the In-built max() Function
C++ provides a library function named max() to find the maximum out of two numbers. It is defined inside the <algorithm> header file. We can use this function to find the maximum out of three numbers as shown in the below program.
C++ Program to Find the Maximum Among the Three Numbers using max() Function
C++
#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
int a, b, c;
a = 10, b = 20, c = 30;
int ans;
ans = max(a, max(b, c));
cout << ans << " is the largest";
return 0;
}
|
Complexity Analysis
- Time Complexity: O(1)
- Auxiliary Space: O(1)
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