strings to array and locating a character in a string - c

Question

i am working on a program where the input is an ID of 9 numbers :
program checks if the id is correct or not by :-
checking if the string is formed by numbers only .
every number has a weight of 1 or 2 so it should be 1 2 1 2 1 2 1 2
1
multiply the weight and the number
if the number is bigger than 9 then add the numbers forming it .
if the number is from multiplication of 10 then the ID is correct ..
example :-
1 7 9 3 7 9 2 5 0-ID
1 2 1 2 1 2 1 2 1-Weight
1 14 9 6 7 18 2 10 0-num x weight
1 5 9 6 7 9 2 1 0-(4)
sum = 40 then it is a correct ID.
I wrote most of it but then i noticed that it has to be a string . so my questions are :
is there a way to put a string into an array?as doing it with an
array is way easier.
how do i locate a place in a string ? like if i want the third
character in a string how do i locate it?.
and here is the code that i did it does not work yet and it needs alot of changes but i guess i will put it anyways :-
#include<stdio.h>
#define N 9
void input(int num[N]);
int check(int num[N]);
int main()
{
int num[N],a;
input(num);
a = check(num);
if (a = 1)
printf("ID is correct");
else printf("ID is NOT correct");
}
void input(int num[N])
{
int i;
printf("Enter your ID (9digits) :-");
for (i = 0;i < N;i++)
scanf("%d",num[i]);
}
int check(int num[N])
{
int w[N] = { 1,2,1,2,1,2,1,2,1 },wxnum[N],i,tota[N],sum,g;
for (i = 0;i < N;i++)
wxnum[i] = num[i] * w[i];
for (i = 0;i < N;i++)
{
if (wxnum[i] > 9)
tota[i] = wxnum[i] / 10 + wxnum[i] % 10;
else tota[i] = wxnum[i];
}
sum = tota[0] + tota[1] + tota[2] + tota[3] + tota[4] + tota[5] + tota[6] + tota[7] + tota[8];
g = sum % 10;
if (g = 0)
return 1;
else
return 0;
}
Thanks everyone for your help.

Answer 1

You can get a string by doing
/*N is defined as 9 in your code.*/
/*Considering there is always a '\0' in every string, we should allocat N + 1 slot for your nine numbers and the extra '\0'.*/
char chStr[N + 1];
scanf("%s", chStr);
After you got the string, you can take advantage of the values of charactor '0' - '9' (their values are from 48 to 57 correspondingly) in ASCII table, and easily transfer the charactors into integers by doing:
int i = 0;
for (i = 0; i < N; i++)
{
chStr[i] = chStr[i] - '0';
}
If you are restrict on the type, you can transfer these char values into int values by adding extra two lines:
int num[N];
int i = 0;
for (i = 0; i < N; i++)
{
chStr[i] = chStr[i] - '0';
num[i] = (int) chStr[i];
}
Please note that my code didn't check the validation of user input. To make it more secure, you can use
scanf("%9s", chStr);
to declare the maximum length that the user can input.