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# Having Trouble with my C Script that determines Prime and Perfect numbers HELP!:)

Posted on 2004-10-28

I am having problems making this script below work. I want this script to check the numbers input from file imput.txt and tell me if they are Prime or Perfect. (example numbers would be 110, 7, 10, 6 etc. New to C and trying to learn it by doing these types of excersizes. Can someone tell me what I am doing wrong?

Thanks in advance,

Jennifer SEE SCRIPT BELOW:)

# include <stdio.h>

# include <math.h>

int main ()

{

FILE *inp;

FILE *outp;

int num, total, i;

float ans;

int IsPrim;

//Initialize

num = 0;

do

{

inp=fopen("C:input.txt", "r");

outp=fopen("C:output.txt", "w");

fscanf(inp, "%d", num);

printf(outp, "%d", num);

/* printf("\nEnter a number from 1 to 1000>");

scanf("%d", num); */

}

while (num<=0 || num>=1001);

//Initialize

total = 0;

ans = 0;

// For prime

ans = 1;

IsPrim = 1;

for(i = 2; i < num; i++);

if ( num % i == 0)

{

IsPrim=0;

printf("Divisor of prime");

}

if(IsPrim)

printf("It is Prim");

// For perfect

total = 0;

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

if(num%i==0)

total+=i;

if(total==num)

{

printf("Perfect");

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

if(num%i==0)

printf("Perfect divisor");

}

fclosef (inp);

fclosef (outp);

return (0);

}