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In this tutorial, you will learn and get code about how to find and print the largest number between any given two numbers by user (at run-time) with following approaches:

- using if-else Statement
- using Ternary Operator
- using Function

To find the largest or greatest one between any given two numbers in C programming, you have to ask from the user to enter any two number to check and find out which one is larger as shown in the program given below:

#include<stdio.h> #include<conio.h> int main() { int a, b, big; printf("Enter any two number: "); scanf("%d%d", &a, &b); if(a>b) big=a; else big=b; printf("\nBiggest of the two number is: %d", big); getch(); return 0; }

As the above program was written in **Code::Blocks** IDE, therefore after successful build and run, it will produce the following result:

Now you have to supply any two numbers say **10** and **20** and then press `ENTER`

to see the
output as given in the second snapshot here. As we all knows that 20 is greater than 10, therefore you will see 20 as output:

If you want to check with first number as 20 and second number as 10, then you can also go for that Here is the output:

- Take any two number and put it in two variables say
**a**and**b** - Check whether
**a**is greater than**b**or not using**if**statement - If it is, then value of
**a**will be initialized to**big** - Otherwise, value of
**b**will be initialized to**big** - Whatever the biggest value is,
**big**holds it - Finally print the value of
**big**variable as output

Here is another program that does the same job as of previous one. This program uses ternary operator to find the greater one:

#include<stdio.h> #include<conio.h> int main() { int num1, num2, large; printf("Enter any two numbers: "); scanf("%d%d", &num1, &num2); large = (num1>num2) ? num1 : num2; printf("\nLargest = %d", large); getch(); return 0; }

Here is the first screenshot of sample run:

Now supply any two numbers and press `ENTER`

to see the largest number as shown here in the second snapshot:

The main logical code is:

large = (num1>num2) ? num1 : num2;

Here if **num1** is greater than **num2**, then num1 will be initialized to large, otherwise num2 will be initialized to large.

Or you can says that, if num1 is greater than num2, then the whole expression after **large = ** will become **num1;**, therefore the statement becomes:

large = num1;

Otherwise (if num1 is less than num2), then statement becomes:

large = num2;

This is the last program where I've created a function **findLarge()** that takes both the number given by user as argument, and will return the largest one.

#include<stdio.h> #include<conio.h> int findLarge(int, int); int main() { int num1, num2, larg; printf("Enter any two numbers: "); scanf("%d%d", &num1, &num2); larg = findLarge(num1, num2); printf("Largest = %d", larg); getch(); return 0; } int findLarge(int a, int b) { if(a<b) return b; else return a; }

Here is the final snapshot of the sample run:

Inside the function named **findLarge()**, if value at **b** is greater than the value at **a**, then **b** will be
returned and initialized to the **large** variable, otherwise **a** will be returned and initialized to the **large** variable inside the **main()** function.

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