C Programming by Jena Sisir Kumar;

Author:Jena, Sisir Kumar; [Jena, Sisir Kumar]
Language: eng
Format: epub
Publisher: CRC Press LLC
Published: 2021-11-21T00:00:00+00:00

By analyzing the above Program 9.5, we conclude that if we solve multiple works inside a single function then the program size increases and is prone to errors. Debugging of the above program is also difficult. To avoid this difficulty, we can use the concept of a function. We can separate the above functionality into three functions as shown in Figure 9.7.

Figure 9.7 Separating functionality using different functions.

Program 9.5

1. #include<stdio.h> 2. void main() 3. { 4. int N, i, sum=0, count=0; 5. printf("
Enter a number: "); 6. scanf("%d", &N); 7. 8. /*Code to check whether the number is prime or not*/ 9. for(i=1;i<=N;i++) 10. { 11. if(N%i==0) 12. count=count+1; 13. } 14. if(count==2) 15. printf 16. else 17. printf("
THE NUMBER IS NOT A PRIME NUMBER"); 18. /*Code to check whether the number is a perfect number or not*/ 19. 20.for(i=1;i<=N/2;i++) 21. { 22. if(N%i==0) 23. sum=sum+i; 24. } 25. if(sum==N) 26. printf("
THE NUMBER IS A PERFECT NUMBER"); 27. else 28. printf("
THE NUMBER IS NOT A PERFECT NUMBER"); 29. }

Output:

Run-1

Enter a number: 28

THE NUMBER IS NOT A PRIME NUMBER

THE NUMBER IS A PERFECT NUMBER

Run-2

Enter a number: 43

THE NUMBER IS A PRIME NUMBER

THE NUMBER IS NOT A PERFECT NUMBER

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