Write a C program to find a given number is automorphic or not?

Answer 1

#include<stdio.h>

#include<conio.h>

void main()

{

int s,c,p,n,i,t;

printf("Enter a number:");

scanf("%d",&n);

s=n*n;

c=0;

p=1;

t=n;

while(n!=0)

{

c++;

n=n/10;

}

for(i=1;i<=c;i++)

p=p*10;

if(s%p==t)

printf("The number is automorphic.");

else

printf("Not automorphic.");

getch();

}

Answer 2

1. #include
2. bool IsPrime(int num)
3. {
4. if(num == 0)
5. return true;
6. num = abs(num);
7. for(int i = 2; i <= sqrt(num); i++)
8. if(num % i == 0)
9. return false;
10. return true;
11. }

Answer 3

#include<stdio.h>

bool is_automorphic (const int num) {

long int sq = num * num;

int sum = 0;

while (sq && (sum < num)) {

sum += (int)(sq % 10);

sq /= 10;

}

return sum==num;

}

int main (void) {

int num;

for (;;) {

printf ("\nEnter a positive integer (0 to end): ");

scanf ("%d", num);

if (!num) break;

if (is_automorphic (num))

printf ("The number %d is automorphic\n", num)

else

printf ("The number %d is not automorphic\n", num)

}

return 0;

}