Write Shell programme to check number is perfect or not?

Answer 1

Write a shell program to test whether the given number is a perfect number or not.

#include
#include
void main()
{
int n,s=0,i;
clrscr()
printf("s=");
scanf("%d",&n);
for(i=0;i{
if(n==s)
printf("prfect");
else
printf("not");
getch();
}

Answer 2

#include<stdio.h>

main()

{

int s=0,i=1,n

printf("Enter a number:-");

scanf("%d",&n);

while(i<=n)

{

if(n%i==o)

s=s+i;

i++;

}

if(s==2*n)

printf("The number %d is a perfect number\n",n);

else

printf("The number %d is not a perfect number\n",n);

}

Answer 3

#include <stdio.h>

int

main() {

int candidate;

int divisor;

int sum_of_divisors;

// test numbers 1..2^15 for perfection

for (candidate=1; candidate<=8192; candidate++) {

sum_of_divisors = 1; // all are divisible by 1

// try other divisors

for (divisor=candidate/2; divisor>1; divisor--) {

// is divisor of candidate?

if (candidate % divisor candidate) {

printf("%d is perfect.\n", candidate);

}

}

}