Serial string sum comparison

Projects Programming
3
  • see the ASCII chart for what char values 0-15 represent
  • since '"TO"' is a c-string, the "+" is not how strings are appended together
  • since both comrx and '"TO"' are c-strings, "==" is not how they are compared (use strcmp())

consider the two approaches demonstrated in the code below to compare strings or extract the integer value from "comrx" that can more easily be compared

  TO3  TO0    3
  TO3  TO1    2
  TO3  TO2    1
  TO3  TO3    0
  TO3  TO4   -1
  TO3  TO5   -2
  TO3  TO6   -3
  TO3  TO7   -4
  TO3  TO8   -5
  TO3  TO9   -6
  TO3 TO10    2
  TO3 TO11    2
  TO3 TO12    2
  TO3 TO13    2
  TO3 TO14    2
  TO3 TO15    2
 n = 3

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

int
main ()
{
    const char *comrx = "TO3";

    for (int i = 0; i <= 15; i++)  {
        char s [10];
        sprintf (s, "TO%d", i);
        printf (" %4s %4s %4d\n", comrx, s, strcmp (comrx, s));
    }


    int  n;
    sscanf (comrx, "TO%d", & n);
    printf (" n = %d\n", n);

    return 0;
}