Can anyone help me out with this problem? Determine the following information ab

Question

Can anyone help me out with this problem?

Determine the following information about each value in list of positive integers:

a. is the value a multiple of  7, 11, or 13?

b. Is the sum of the digits odd or even?

c. Is the value a prime number?

You should write a function with three type int output parameters that send back the answers to these three questions.

Sample input data are:

104 3773 13 121 77 30751

Ask the user to enter a positive integer and signal they are finished with a sentinel value (chapter 6)

The function should send back answers through output parameters

1 if the number is a multiple of 7, 11 or 13 and 0 if it is not.

1 if the sum of the digits is odd and 0 if the sum of the digits is even

1 if the number is a prime number and zero if it is not.

.I need C programming no C++! And I have to use pointers, I would post some of my code, but I can't copy it :(

Explanation / Answer

#include<stdio.h>
#include<math.h>
int array[3];
int *check(int value)
{
    int sum=0,r,i,value1;
    //checking divisiblity with 7,11,13
    if(value%7==0 || value%11==0 || value%13==0)
        array[0]=1;
    else
        array[0]=0;
    //sum of digits
    value1=value;
    for(;value1!=0;value1=value1/10)
    {
        r=value1%10;
        sum=sum+r;
    }
    if(sum%2==0)
        array[1]=0;
    else
        array[1]=1;
    //checking prime or not
    int sq = sqrt(value);
    int flag=0;       
    for(i=2;i<sq;i++)
    {
        if(value%i==0)
        {
            flag=1;
            break;
        }
    }
    if(flag==1)
        array[2]=0;        //flag==1 means it is not prime
    else
        array[2]=1;        //flag=0 means it is prime
    return array;        //return the pointer of the array
}
int main()
{
    int sentinel=-1,scan,*oparray,i;
    printf("Enter a number : ");
    printf("Enter -1 to exit ");
    scanf("%d",&scan);
    while(scan!=sentinel)
    {
        oparray=check(scan);                                      //oparray stores the pointer of the output array in the check function
    printf("1 if the number is a multiple of 7, 11 or 13 and 0 if it is not.    OUTPUT : %d ",oparray[0]);
        printf("1 if the sum of the digits is odd and 0 if the sum of the digits is even OUTPUT : %d ",oparray[1]);
        printf("1 if the number is a prime number and zero if it is not.    OUTPUT : %d ",oparray[2]);
        printf("Enter a number : ");
        printf("Enter -1 to exit ");
        scanf("%d",&scan);
    }    
    return 0;
}

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