Get length of substring composed of given characters: how to use strspn : String Length « String « C / ANSI-C

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C / ANSI-C » String » String LengthScreenshots 
Get length of substring composed of given characters: how to use strspn


#include <stdio.h>
#include <string.h>

int main ()
{
  int i;
  char key[] "890th";
  char str[] "1234567890";

  i = strspn (key, str);
  
  printf ("Length of initial number is %d\n", i);
  return 0;
}

           
       
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