Skip to content

C Program To Find Largest Number In An Array Easy Way

C program to find largest number in an array with simple logic and example and test cases.

Example:
Input Array: 2 6 4 8 9
Output: 9

LOGIC:

  • Create an integer variable and store first element of the array into it, assuming this is largest value.
  • Traverse the array using for a loop from location 1 to array length -1. 0th location we have already stored in largest variable.
  • Check if current element is larger than value stored in largest variable. If it is larger, then assign the largest variable with current array location value.
  • Once loop is over, largest variable contains largest/max value.

C Program To Find Largest Number In An Array

/* --------------------------------------------------
* C Program to find largest number in Array
*/
#include<stdio.h>
/* --------------------------------------------------
* C function to find largest element
* in an integer array
*
* @ parameters: 
* int*arr : It accept base address of int array
* int len : length of the array
*
*
* @ return : It returns the largest / maximum
* value from array
*/
int findLargest( int *arr, int len){

	int largest, i;
	
	//Assume first element is largest
	largest = arr[0];
	for(i=1; i<len; i++) { 
            /* If current element is larger, then assign 
            * value to largest variable.
            */
             if(arr[i] > largest){
			largest = arr[i];
		}
	}

	//Return the largest number
	return largest;
}



/* --------------------------------------------------
*	C TEST PROGRAM
*/

int main()
{
	int largestNumber;
    int arr[30];//you can change the capacity
    int index,size;

    /* Enter size of the int array */
    printf("Enter The Size of array: ");
    scanf("%d", &size);

    /* Input array elements */
	printf("Enter elements: ");
    for(index=0; index<size; ++index)
    {
        scanf("%d", &arr[index]);
    }   

	//Call function to get largest number
	largestNumber = findLargest(arr, size);
	printf("Largest Element = %d", largestNumber);

	
    return 0;
}

Output:
Test case-1
Enter The Size of array: 5
Enter elements: 2 6 4 8 9
Largest Element = 9

Test case -2: With duplicate elements
Enter The Size of array: 5
Enter elements: 9 2 2 5 6
Largest Element = 9


Published inC Programming Examples