# C Program to second largest & smallest number in an array

In this c program, we need to calculate the second largest and smallest number of the given numbers in a list or array. Also, calculate the average of the second largest and smallest number. And again, check the average number is present in the list.

## How to sort an array to get the second largest?

To find out the second largest number in an array, we have to sort the array in descending order. Means arrange the number in biggest to smallest. So the number in the second position of the array will be the second-largest number. It will be easy to get that after sorting the array.

## How to get the second smallest number in an array?

To find the second smallest number in an array, we have to sort the array in descending order means arrange the number from biggest to smallest. So the number in the n-2 the position of the array will be the second-smallest number.

The logic of this program is, first read some numbers from the user and save it in an array. By using nested `for loop`, arrange the numbers in descending order. Then display the numbers arranged in descending order as the sorted array. Display the second largest number as the number[1] and the second smallest number as the number[n-2].

Now calculate average = number[1] + number[n-2]) /2. Set the counter = 0.By using a `for loop` with the condition' i '

### ALGORITHM

STEP 1: Include the header files to use the built-in functions in the C program.

STEP 2: Declare the integer variables i, j, a, n, counter, ave, and the Array number[30].

STEP 3: Read the value of N into the variable n.

STEP 4: Read the numbers into the array number[i] using `for loop`.

STEP 5: Set i=0.

STEP 6: Check the condition i

STEP 7: set j=i+1.

STEP 8: Check if number[i]

STEP 9: Increment j by 1 and do step 8.

STEP 10: Increment 'i' by 1 do step 6.

STEP 11: Display the numbers arranged in descending order as the numbers in the array number[] using `for loop`.

STEP 12: Display The 2nd largest number as the number[1].

STEP 13: Display The 2nd smallest number as the number[n-2].

STEP 14: Calculate ave=(number[1] +number[n-2])/2.

STEP 15: Set counter=0.

STEP 16: By using a `for loop` with the condition i

STEP 17: Check if ave==number[i] then increment counter by 1.

STEP 18: Repeat step 16 by incrementing the value of 'i' by 1.

STEP 19: Check if counter==0 then display ,the average of the number[1] and number[n-2] =ave is not in the array.

STEP 20: Check if counter==1 then display ,the average of the number[1] and number[n-2] =ave is present in the array.

## C Source Code

```                                          ```#include <stdio.h>

void main() {
int number[30];
int i, j, a, n, counter, ave;
printf("Enter the value of N\n");
scanf("%d", & n);
printf("Enter the numbers \n");
for (i = 0; i < n; ++i)
scanf("%d", & number[i]);
for (i = 0; i < n; ++i) {
for (j = i + 1; j < n; ++j) {
if (number[i] < number[j]) {
a = number[i]; /* interchange the numbers to make it in proper order */
number[i] = number[j];
number[j] = a;
}
}
}
printf("The numbers arranged in descending order are given below\n");
for (i = 0; i < n; ++i) {
printf("%d\n", number[i]);
}
printf("The 2nd largest number is  = %d\n", number[1]);
printf("The 2nd smallest number is = %d\n", number[n - 2]);
ave = (number[1] + number[n - 2]) / 2;
counter = 0;
for (i = 0; i < n; ++i) {
if (ave == number[i]) {
++counter;
}
}
if (counter == 0)
printf("The average of %d and %d is = %d is not in the array\n", number[1], number[n - 2], ave);
else
printf("The average of ?nd %d in array is %d in numbers\n", number[1], number[n - 2], counter);
} /* End of main() */```
```

## OUTPUT

```Enter the value of N
6

Enter the numbers
30
80
10
40
70
90

The numbers arranged in descending order are given below
90
80
70
40
30
10

The 2nd largest number is  = 80
The 2nd smallest number is = 30
The average of 80  and 30 is = 55 is not in the array```
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