Perfect Number Program in C
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A perfect number in mathematics is an integer with a sum equal to its positive divisor, not including the number itself. This blog will cover all the details about perfect numbers using C.
Introduction
A perfect number program in c is a number whose sum equals its positive divisor but excludes the number itself. For instance, 6 is divisible by 1, 2, and 3. The number also divides itself, but the number divisible by itself is excluded for a perfect number. When the divisors are added, , the result is also 6, which equals the number considered. Hence, the number 6 is perfect.
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C Program to Check Perfect Number or Not
Using for Loop
Program to check whether the number taken from a user is perfect or not in C
Output :
Explanation:
In the given example, the loop is iterated for every value of i. A remainder is calculated, and if it is equal to 0, then sum=sum+j. Out of the loop, there is a condition that checks whether or not the sum is equal to the number, and accordingly, the print statement is executed.
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Using While Loop
Program to check whether the number taken from a user is perfect or not in C
Output :
Explanation:
In the given example, the while loop is iterated for every value of i. A sum is calculated. Out of the loop, a condition checks whether or not the sum is equal to the number, and accordingly, the print statement is executed.
Using Recursion
Program to check whether the number taken from a user is perfect or not in C using recursion.
Output :
Explanation:
In the given example, the function PerfectNum does the calculation and returns the sum. Out of the loop, a condition checks whether or not the sum is equal to the number, and accordingly, the print statement is executed.
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C Program to Find Perfect Number between 1 to 1000
Output :
Explanation:
In the given example, a and b are variables used for iteration; the end is the last number. For instance, in 1 to 1000, 1000 is the end since it is the last number. It iterates from 1 to 1000, and at each iteration, it checks whether the number is perfect or not. If the number is perfect, then the print statement will be executed.
Conclusion
- In mathematics, A perfect number program in C is an integer with a sum equal to that of its positive divisor, not including the number itself. For instance, the number 6 is completely divisible by 1, 2, and 3.
- The number also divides itself, but for a perfect number, the number divisible by itself is excluded. When the divisors are added, 1+2+3, the result is also 6, which is equal to the number that is considered. Hence, the number 6 is perfect.