C Exercises: Find the second largest element in an array

C Array: Exercise-16 with Solution

Write a program in C to find the second largest element in an array.

Visual Presentation:

Sample Solution:

C Code:

#include <stdio.h>

void main() {
    int arr1[50], n, i, j = 0, lrg, lrg2nd;

    // Prompt user for input
    printf("\n\nFind the second largest element in an array :\n");
    printf("-------------------------------------------------\n");
    printf("Input the size of the array : ");
    scanf("%d", &n);

    // Input values for the array
    printf("Input %d elements in the array :\n", n);
    for (i = 0; i < n; i++) {
        printf("element - %d : ", i);
        scanf("%d", &arr1[i]);
    }

    // Find the location of the largest element in the array
    lrg = 0;
    for (i = 0; i < n; i++) {
        if (lrg < arr1[i]) {
            lrg = arr1[i];
            j = i;
        }
    }

    // Ignore the largest element and find the second largest element in the array
    lrg2nd = 0;
    for (i = 0; i < n; i++) {
        if (i == j) {
            i++;  // Ignore the largest element
            i--;
        } else {
            if (lrg2nd < arr1[i]) {
                lrg2nd = arr1[i];
            }
        }
    }

    // Display the second largest element
    printf("The Second largest element in the array is :  %d \n\n", lrg2nd);
}

Sample Output:

Find the second largest element in an array :                                                                 
-------------------------------------------------                                                             
Input the size of array : 5                                                                                   
Input 5 elements in the array :                                                                               
element - 0 : 2                                                                                               
element - 1 : 9                                                                                               
element - 2 : 1                                                                                               
element - 3 : 4                                                                                               
element - 4 : 6                                                                                               
The Second largest element in the array is : 6   

Flowchart:

C Programming Code Editor:

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