Natural Numbers

C Program To Print Natural Numbers Between Two Numbers using for loop

Lets write a C program to print natural numbers between two user entered numbers, using for loop.

We check if the user has entered smaller number first and then the larger number. If not, we swap the numbers present in the variables min and max.

C Program To Find Factorial of a Number using for Loop

[youtube https://www.youtube.com/watch?v=mF0o3LC1its]

YouTube Link: https://www.youtube.com/watch?v=mF0o3LC1its [Watch the Video In Full Screen.]

Source Code: C Program to Print Natural Numbers Between Two Numbers using for loop

 
#include<stdio.h>

int main()
{
    int min, max, temp, count;

    printf("Enter 2 positive numbers\n");
    scanf("%d%d", &min, &max);

    if(min > max)
    {
        temp = min;
        min  = max;
        max  = temp;
    }

    printf("Natural numbers from %d to %d are:\n", min, max);

    for(count = min; count <= max; count++)
    {
        printf("%d\n", count);
    }

    return 0;
}

Output 1:
Enter 2 positive numbers
10
15
Natural numbers from 10 to 15 are:
10
11
12
13
14
15

Output 2:
Enter 2 positive numbers
15
10
Natural numbers from 10 to 15 are:
10
11
12
13
14
15

Logic To Print Natural Numbers Between Two Numbers using for loop

We ask the user to enter 2 numbers, and store it inside variables min and max. For loop keeps iterating till min is less than or equal to max. We assign the value of min to count and keep incrementing the value of count by 1 for each iteration of the for loop. Once value of count is greater than value of max, control exits for loop.

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C Program to Print Natural Numbers from 1 to N In Reverse Order using for loop

Lets write a simple C program to print natural numbers from 1 to N in reverse order, using for loop.

C Program to Print Natural Numbers from 1 to N In Reverse Order using for loop

[youtube https://www.youtube.com/watch?v=07rwVW3TVUo]

YouTube Link: https://www.youtube.com/watch?v=07rwVW3TVUo [Watch the Video In Full Screen.]

Source Code: C Program to Print Natural Numbers from 1 to N In Reverse Order using for loop

 
#include<stdio.h>

int main()
{
    int num, count;

    printf("Enter a positive number\n");
    scanf("%d", &num);

    printf("\nNatural numbers from %d to 1 are:\n", num);

    for(count = num; count >= 1; count--)
    {
        printf("%d\n", count);
    }

    return 0;
}

Output:
Enter a positive number
14

Natural numbers from 14 to 1 are:
14
13
12
11
10
9
8
7
6
5
4
3
2
1

Natural numbers from 10 to 1 are:

Logic To Print Natural Numbers from 1 to N In Reverse Order using for loop

We ask the user to enter a positive number, and store it inside a variable num. We assign value of num to variable count. We iterate through the loop until the count is equal to zero. For example, if user enters num = 5, we iterate the loop 5 times. In for loops modification section we keep decrementing the value of variable count. Once the value of count becomes 0, we exit the for loop. For each iteration we print the value of count.

This way we printout the natural numbers from 1 to N, in reverse order.

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C Program to Print Natural Numbers from 1 to N using for loop

Lets write a simple C program to print natural numbers from 1 to N, using for loop.

Related Read:
For Loop In C Programming Language

Source Code: C Program to Print Natural Numbers from 1 to N using for loop

 
#include<stdio.h>

int main()
{
    int num, count;

    printf("Enter a positive number\n");
    scanf("%d", &num);

    printf("\nNatural numbers from 1 to %d are:\n", num);

    for(count = 1; count <= num; count++)
    {
        printf("%d\t", count);
    }

    printf("\n");

    return 0;
}

Output:
Enter a positive number
5

Natural numbers from 1 to 5 are:
1 2 3 4 5

C Program to Print Natural Numbers from 1 to N using for loop

[youtube https://www.youtube.com/watch?v=sbIwx-_A5D0]

YouTube Link: https://www.youtube.com/watch?v=sbIwx-_A5D0 [Watch the Video In Full Screen.]

Logic To Print Natural Numbers from 1 to N using for loop

We start by assigning 1 to variable count. Now we ask the user to enter a positive number. Now for loop keeps executing until value of count is less than or equal to user entered value. Inside for loop we printout the value of count and then increment the value of count by one for each iteration of loop.

This way we printout all the natural numbers from 1 to N.

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C Program To Print Floyd’s Triangle In Reverse

Lets write C program to print Floyd’s Triangle in reverse, using nested while loop.

Floyd’s Triangle: is a right angled Triangle formed with natural numbers.

Logic To Print Floyd’s Triangle In Reverse

We ask the user to input the number of rows of Floyd’s Triangle, we store it inside variable num. We assign 1 to variable nn(natural number). Variable num has the number of natural numbers to be printed in particular row. The inner while loop prints the natural numbers upto num.

For Example, if user enters num = 5, the following Triangle will be printed:

1 2 3 4 5
6 7 8 9
10 11 12
13 14
15

Note that the Triangle printed is a right angled Triangle and has 5 rows of natural numbers.

Source Code: C Program To Print Floyd’s Triangle In Reverse

#include < stdio.h >

int main()
{
    int num, nn = 1, count;

    printf("Enter no of rows of Floyd's Triangle\n");
    scanf("%d", &num);
    
    printf("\n");
    while(num)
    {
        count = 1;
        while(count <= num)
        {
            printf("%d  ", nn);
            nn++;
            count++;
        }
        printf("\n");
        num--;
    }

    return 0;
}

Output 1:
Enter no of rows of Floyd’s Triangle
5

1 2 3 4 5
6 7 8 9
10 11 12
13 14
15

Output 2:
Enter no of rows of Floyd’s Triangle
14

1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69
70 71 72 73 74 75 76 77
78 79 80 81 82 83 84
85 86 87 88 89 90
91 92 93 94 95
96 97 98 99
100 101 102
103 104
105

Video Tutorial: C Program To Print Floyd’s Triangle In Reverse

[youtube https://www.youtube.com/watch?v=7CTZGsGm6yE]

YouTube Link: https://www.youtube.com/watch?v=7CTZGsGm6yE [Watch the Video In Full Screen.]

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

C Program To Print Floyd’s Triangle

Lets write C program to print Floyd’s Triangle, using nested while loop.

Floyd’s Triangle: is a right angled Triangle formed with natural numbers.

Logic To Print Floyd’s Triangle

We ask the user to input the number of rows of Floyd’s Triangle, we store it inside variable num. We assign 1 to variables count and count1. Variable count is used to print the natural numbers for Floyd’s Triangle. Variable count1 is used to keep track of outer while loop. Variable count2 is used to keep track of inner while loop.

For Example, if user enters num = 5, the following Triangle will be printed:

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

Note that the Triangle printed is a right angled Triangle and has 5 rows of natural numbers.

Important Note:
Also note that first row has 1 number. Second row has 2 numbers. Third row has 3 numbers and so on. So row number and total numbers in that particular row are always equal in any Floyd’s Triangle.

Outer While loop
In our C program, row number and the total numbers to be printed for that row is present inside variable count1.

Inner While loop
Inner while loop prints natural numbers in each row. Variable count2 is assigned to 1 for each iteration of outer while loop, so that the numbers gets printed from the first position in any selected row.

Source Code: C Program To Print Floyd’s Triangle

#include<stdio.h>

int main()
{
    int num, count = 1, count1 = 1, count2;

    printf("Enter no of rows for Floyd's Triangle\n");
    scanf("%d", &num);

    printf("\n");

    while(count1 <= num)
    {
        count2 = 1;
        while(count2 <= count1)
        {
            printf("%d  ", count);
            count++;
            count2++;
        }
        count1++;
        printf("\n");
    }

    return 0;
}

Output 1:
Enter no of rows for Floyd’s Triangle
5

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

Output 2:
Enter no of rows for Floyd’s Triangle
14

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45
46 47 48 49 50 51 52 53 54 55
56 57 58 59 60 61 62 63 64 65 66
67 68 69 70 71 72 73 74 75 76 77 78
79 80 81 82 83 84 85 86 87 88 89 90 91
92 93 94 95 96 97 98 99 100 101 102 103 104 105

Video Tutorial: C Program To Print Floyd’s Triangle

[youtube https://www.youtube.com/watch?v=5olpgYeAUKU]

YouTube Link: https://www.youtube.com/watch?v=5olpgYeAUKU [Watch the Video In Full Screen.]

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