C Program to Find Largest Number in an Array

In this article we will write C Program to Find Largest Number in an Array. Or, How to find the largest or biggest number present in the One Dimensional Array, and also the index position of the largest number in an Array. Before going into this article Please refer Array in C article to understand the concept of Array size, index position etc.

C Program to Find Largest Number in an Array Example

This program asks the user to enter Array Size, array elements. Next, it is going to find the garages element in this array using For Loop.

/* C Program to Find Largest Number in an Array */
#include<stdio.h>

int main()
{
  int a[10], Size, i, Largest, Position;
  
  printf("\nPlease Enter the size of an array \n");
  scanf("%d",&Size);
  
  printf("\nPlease Enter %d elements of an array: \n", Size);
  for(i=0; i<Size; i++)
   {
     scanf("%d",&a[i]);
   }   
  
  Largest = a[0];
  for(i=1; i<Size; i++)
   {
    if(Largest<a[i])
     {
       Largest=a[i];
       Position = i;
     }   
   }
  
  printf("\nLargest element in an Array = %d", Largest);
  printf("\nIndex position of the Largest element = %d", Position);
  
  return 0;
}

OUTPUT

ANALYSIS
In this Program, We declared 1 One Dimensional Arrays a[] of size 10 and also declared i to iterate the Array elements, Largest variable to hold the largest element in an Array and Position variable to hold the Index position of the largest element in an Array.

Below printf statement asks the User to enter the array a[] size (Number of elements an Array can hold).

printf("\n Please Enter the size of an array \n");

Below scanf statement will assign the user entered values to Size variable.

scanf("%d",&Size);

Below For loop will help to iterate each and every cell present in the a[4] array. Condition inside the for loops (i < Size) will ensure the compiler, not to exceed the array limit.

scanf statement inside the for loop will store the user entered values in every individual array element such as a[0], a[1], a[2], a[3]

for(i=0; i<Size; i++)

In the next line, We assigned the a[0] value to the Largest variable.

Largest = a[0];

In the next line, We have one more for loop, it is used to iterate each and every element in an array. If Statement inside the For loop will find the largest Number in an Array by comparing each element in the array with the Largest value.

for(i=1; i<Size; i++)

From the above screenshot you can observe that, User inserted values are
a[4] = {10, 25, 95, 75}
Largest = a[0] = 10

First Iteration
The value of i will be 1 and the condition (i < 4) is True. So, it will start executing the statements inside the loop until the condition fails.
If statement (Largest < a[i]) inside the for loop is True because (10 < 25)
Largest = a[i]
Largest = a[1]
Largest = 25
Position = 1

Second Iteration
The value of i will be 2 and the condition (i < 4) is True. So, it will start executing the statements inside the loop until the condition fails.
If statement (Largest < a[i]) inside the for loop is True because (25 < 95)
Largest = a[i]
Largest = a[2]
Largest = 95
Position = 2

Third Iteration
The value of i will be 3 and the condition (i < 4) is True. So, it will start executing the statements inside the loop until the condition fails.
If statement (Largest < a[i]) inside the for loop is False because (95 < 75). So largest value will not be updated. It means
Largest = 95
Position = 2

Fourth Iteration
After the incrementing the value of i, i will become 5 So, the condition (i < Size) will fail. So it will exit from the loop.

Below printf statement is used yo print the Largest Number inside an Array. In this example, it is 95

printf("\nLargest element in an Array = %d", Largest);

Below printf statement is used yo print the Index Position of the Largest Number inside an Array. In this example, it is occurred at position 2

printf("\nIndex position of the Largest element = %d", Position);

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