Sum of Natural number in C language..

Let’s understand some concept.

Natural Number..

All counting number which start from 1, 2, 3, 4, 5, 6, 7, 8, 9…………………. Infinite…

Sum of Natural Number a=n/2*(n+1) if you enter number then the sum done by this formula…

Some important symbols used in code.

• () small bracket
• && use for ‘and’ use for address
• {} curly bracket
• “” double code

The sum of Natural Number by using Formula..

1. #include<stdio.h>
2. #include<conio.h>
3. void main()
4. {
5. int a, b=0, c;
6. clrscr();
7. printf(“Sum of Natural number from 1 to 100”)
8. a=100;
9. b=a/2*(b+1);
10. printf(“%d”, b);
11. getch();
12. }

Inputs..

If a=100 then

Results..

The sum of Natural Number by using ‘for’ loop…

If you enter range of Natural Number then using a loop. A after increment natural Number added by this method b+=a which like a++. In loop same rule follow by Increment and adding in on container like all alphabet.

1. #include<stdio.h>
2. #include<conio.h>
3. void main()
4. {
5. int a, b, c=0;
6. clrscr();
7. printf(“Sum of naturanumber”);
8. for(a=1;a<=100;a++)
9. {
10. c+=a;
11. }
12. printf(“%d”, c);
13. getch();
14. }

Inputs..

If a=100 then

Results..

The sum of Natural Number by using ‘while’ loop..

1. #include<stdio.h>
2. #include<conio.h>
3. void main()
4. {
5. int a, b=0, c;
6. clrscr();
7. printf(“Sum of Natural Number”);
8. a=100;
9. while(a<=100)
10. {
11. b+=a;
12. a++;
13. }
14. printf(“%d”, b);
15. getch();
16. }

Inputs..

If a=100 then

Results..

The sum of Natural Number by using ‘do while’ loop…

1. #include<stdio.h>
2. #include<conio.h>
3. void main()
4. {
5. int a=1, b=0, c;
6. clrscr();
7. printf(“Sum of Natural Number”);
8. do
9. {
10. b+=a;
11. a++;
12. }
13. while(a<=100);
14. printf(“%d”, b);
15. getch():
16. }

Inputs..

If a=100 then

Results..