main()
{
int length = 50, flag = 0, result;
char *input = malloc(length), ch;
puts("Enter number and press return");
scanf("%c", &ch);
//getting input and checking for non numbers on each input
while (ch != 10)
{
if (ch< 48 || ch> 57)
{
puts("Non number entered");
exit(1);
}
input[flag++] = ch;
if (flag == length)
{
length += 20;
input = realloc(input, length);
}
scanf("%c", &ch);
}
length = flag;
result = divisible_by_11(input, length);
(result == 0 || result % 11 == 0) ? puts("Divisible by 11") : puts("Not Divisible by 11");
//free(input);
getch();
}
int divisible1(char *input)
{
long int difference = 0;
int i ;
for (i = 0;input[i];i++)
if (i % 2 == 0)
difference += (input[i] - '0');
else
difference -= (input[i] - '0');
if (difference == 0 || difference == 11 || difference == -11)
return 1;
else if (difference > 0 && difference < 11 || (difference <0 && difference >-11))
return 0;
else
return divisible_by_11(difference);
}
int divisible_by_11(long int number)//generic function that takes the number and finds that if it is divisible by 11
{
int difference = 0, counter = 0;
while (number)
{
if (counter % 2 == 0)
difference += number % 10;
else
difference -= number % 10;
number = number / 10;
}
if (difference == 0 || difference == 11 || difference == -11)
return 1;
else if (difference <0 && difference >-11 || (difference>0 && difference < 11))
return 0;
else
return divisible_by_11(difference);
}
void main()
{
char string_number[10000];
int iterator = 0,result;
printf("Enter the number\n");
do
{
string_number[iterator] = getchar();
iterator++;
} while (string_number[iterator - 1] != '\n');
string_number[iterator - 1] = '\0';
result= divisible_by_11(string_number, iterator - 1);
if (result == 1)
printf("The given number %s is divisble by 11", string_number);
else
printf("The given number %s is not divisible by 11",string_number);
getchar();
}
