I have an integer number, which can be codified on 3 or 4 ciphers (for example, 123, 1234 and so on...) or can be codified on 7 or 8 cipher (for example, 1234567, 12345678 and so on...). Now, the problem is: if the number is codified on 7 ciphers, I only need to save the first 3. For example:

1234567 -> 123

if the number is codified on 8 ciphers, I only need to save the first 4. For example:

12345678 -> 1234

How can I only save the first N cipher of the number into an other int value? Thank you everybody! I thought about something like this:

int number = 12345678;
if(number>9999999){ //if the number is codified on 8 ciphers
...
}else if(number>9999 && number<10000000){ \\if the number is codified on 7 ciphers
...
}else{
...
}

CodePudding user response：

you can make use do while loop. I believe cipher codified only on 7 and 8. If you still continue you can keep adding the code. As far as I understood, i tried to put into code here,

#include <stdio.h>
int main() {
  long long n;
  int num=3;
  int count=0;
  printf("Enter an integer: ");
  scanf("%lld", &n);
  if(n>9999999)
  {
      num=4;
  }
  printf("Number of cipher: %d", num);
  // iterate at least once, then until n becomes 0
  // remove last digit from n in each iteration
  // increase count by 1 in each iteration
  do {
    n /= 10;
    count  ;
  } while (count!=num);
  if(count==3)
  {
      n/=10;
  }
  printf("Number of cipher: %lld", n);
}