no sorting

C Program To Find First and Second Biggest in N Numbers, without using Arrays, using For Loop

Write a C program to find first and second biggest numbers in a list of N numbers entered by the user, without using arrays and without sorting the list and by using for loop.

Video Tutorial: C Program To Find First and Second Biggest in N Numbers, without using Arrays, using For Loop

[youtube https://www.youtube.com/watch?v=EtdVsh9XhS8]

YouTube Link: https://www.youtube.com/watch?v=EtdVsh9XhS8 [Watch the Video In Full Screen.]

Source Code: C Program To Find First and Second Biggest in N Numbers, without using Arrays, using For Loop

#include<stdio.h>

int main()
{
    int limit, num, count, fbig = 0, sbig = 0;

    printf("Enter the limit\n");
    scanf("%d", &limit);

    printf("Enter %d positive numbers\n", limit);

    for(count = 1; count <= limit; count++)
    {
        scanf("%d", &num);

        if(num > fbig)
        {
            sbig = fbig;
            fbig = num;
        }

        if(num > sbig && num < fbig)
        {
            sbig = num;
        }
    }

    printf("First big = %d\nSecond Big = %d\n", fbig, sbig);

    return 0;
}

Output 1:
Enter the limit
5
Enter 5 positive numbers
1
9
5
3
8
First big = 9
Second Big = 8

Output 2:
Enter the limit
8
Enter 8 positive numbers
1
5
9
3
7
8
6
10
First big = 10
Second Big = 9

Logic To Find First and Second Biggest Number in N Numbers, without using Arrays

First we ask the user to enter length of numbers list. If user enters limit value as 5, then we ask the user to enter 5 numbers. Once the user enters limit value, we iterate the for loop until loop counter variable count is less than or equal to limit. For each iteration of for loop we ask the user to enter a positive integer number. We check if the new number entered by the user is greater than fbig. If true, we swap the value of fbig to sbig and value of num to fbig.

Next we check if the user entered number is greater than sbig and less than fbig, if true, we assign the value of num to sbig.

Once control exits for loop, inside fbig we will have biggest number from the list of numbers entered by the user and sbig will have the second biggest number from the list of numbers entered by the user.

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Find First and Second Biggest in N Numbers, without using Arrays: C Program

Write a C program to find first and second biggest numbers in list of N numbers without using arrays and without sorting the list and by using while loop.

Source Code: Find First and Second Biggest in N Numbers, without using Arrays: C Program

 
#include<stdio.h>

int main()
{
    int limit, num, fbig = 0, sbig = 0;

    printf("Enter the limit\n");
    scanf("%d", &limit);

    printf("Enter %d positive numbers\n", limit);
 

    while(limit > 0)
    {
        scanf("%d", &num);

        if(num > fbig)
        {
            sbig = fbig;
            fbig = num;
        }
        if(num > sbig && num < fbig)
        {
            sbig = num;
        }

        limit--;
    }

    printf("First Big is %d\n", fbig);
    printf("Second Big is %d\n", sbig);

    return 0;
}

Output 1:
Enter the limit
5
Enter 5 numbers
1
2
3
4
5
First Big is 5
Second Big is 4

Output 2:
Enter the limit
5
Enter 5 numbers
5
4
3
2
1
First Big is 5
Second Big is 4

Output 3:
Enter the limit
5
Enter 5 numbers
1
4
3
5
2
First Big is 5
Second Big is 4

Output 4:
Enter the limit
8
Enter 8 numbers
1
5
9
3
7
4
6
8
First Big is 9
Second Big is 8

Find First and Second Biggest in N Numbers, without using Arrays: C Program

[youtube https://www.youtube.com/watch?v=gs4YT-Qcw6k]

YouTube Link: https://www.youtube.com/watch?v=gs4YT-Qcw6k [Watch the Video In Full Screen.]

Logic To Find First and Second Biggest Number in N Numbers, without using Arrays

First we ask the user to enter length of numbers list. If user enters limit value as 5, then we ask the user to enter 5 numbers. Once the user enters limit value, we iterate the while loop until limit value is 0. For each iteration of while loop we ask the user to enter a integer number. We check if the new number entered by the user is greater than fbig. If true, we swap the value of fbig to sbig and value of num to fbig. If the new number entered by the user is not greater than fbig, then we check if its greater than sbig. If true, we transfer the value of num to sbig.

Once the value of limit is 0, control exits the while loop, and inside fbig we have first biggest number from the list of numbers entered by the user and sbig will have the second biggest number from the list of numbers entered by the user.

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Find First and Second Biggest In An Array, Without Sorting It: C

We assume that a[0] has first biggest and a[1] has the second biggest value.

Now check if this assumption is correct, if not, swap the values.

 
 if( sbig > fbig )
 {
    temp = sbig;
    sbig = fbig;
    fbig = temp;
 }

Now since we have already checked with a[0] and a[1], we start the comparison from a[2], till N.

for(i=2; i < n ; i++)
 if(a[i] > fbig)
 {
sbig = fbig;
fbig = a[i];
 }
 else if(a[i] > sbig)
sbig = a[i];

Now, if a[i] contains a number which is bigger than fbig, we transfer the value of a[i] to fbig and the value present in fbig to sbig;
If the value of a[i] is not bigger than fbig, then we check it with sbig. If a[i] is bigger than sbig, then we assign the value of a[i] to sbig.

This way, at the end of the loop fbig will have the first biggest and sbig will have the second biggest element/number in the array.

Video Tutorial: Find First and Second Biggest In An Array, Without Sorting It: C

[youtube https://www.youtube.com/watch?v=DzZvT87WuGQ]

YouTube Link: https://www.youtube.com/watch?v=DzZvT87WuGQ [Watch the Video In Full Screen.]

Full source code

#include < stdio.h >
#include < conio.h >
 
void main()
{
int a[20], N, i, fbig, sbig, temp;
clrscr();
 
printf("Enter array limit\n");
scanf("%d", &N);
 
printf("Enter %d array elements\n", N);
for(i=0; i < n ; i++)
 scanf("%d", &a[i]);
 
fbig = a[0];
sbig = a[1];
 
if( sbig > fbig )
{
   temp = sbig;
   sbig = fbig;
   fbig = temp;
}
 
for(i=2; i < n ; i++)
 if(a[i] > fbig)
 {
sbig = fbig;
fbig = a[i];
 }
 else if(a[i] > sbig)
sbig = a[i];
 
 printf("First Big is %d and Second big is %d", fbig, sbig);
 
 getch();
 
}

Output:
Enter array limit
6
Enter 6 array elements
99
108
777
723
786
999
First Big is 999 and Second big is 786