First of all we all should know what is perfect number?
In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself.
Example: 6, divisor of 6 are 1, 2,3. Sum of divisors is 1+2+3=6.
PROGRAM
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#include<stdio.h>
int main() {
int num, i = 1, sum = 0;
printf("Enter a number: ");
scanf("%d", &num);
while (i < num) {
if (num % i == 0) {
sum = sum + i;
}
i++;
}
if (sum == num)
printf("%d is a Perfect Number", i);
else
printf("%d is Non Perfect Number", i);
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #include<stdio.h> int main() { int num, i = 1, sum = 0; printf("Enter a number: "); scanf("%d", &num); while (i < num) { if (num % i == 0) { sum = sum + i; } i++; } if (sum == num) printf("%d is a Perfect Number", i); else printf("%d is Non Perfect Number", i); return 0; } |
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