Programming

  1 //Concatenate two strings
  2
  3 #include<stdio.h>
  4 char *stradd (char *, char *);
  5
  6 int main()
  7 {
  8   char a[] = "abcdefg";
  9   char b[] = "GHIJKLM";
 10   char *c;
 11   printf ("a: %s\n", a);
 12   printf ("b: %s\n", b);
 13   c = stradd (a, b);
 14   printf("c: %s\n", c);
 15 }
 16
 17 char *stradd (char *a, char *b)
 18 {
 19   char *p;
 20   p = a;
 21   while (*a != '\0')
 22     {
 23       a++;
 24       printf("%p\n", a);
 25     }
 26   while (*b != '\0')
 27     {
 28       *a = *b;
 29      // printf("+++%p\n", a);
 30       b++;
 31      // printf("%p\n", b);
 32       a++;
 33      // printf("append-%p\n", a);
 34     }
 35   return p;
 36
 37 }

char a[256] = "abcdefg";
char b[256] = "GHIJKLM";

char *stradd (char *a, char *b)
{
        char *p;
        p = a;

        // Before the loop, A points to the beginning of the string.

        while (*a != '\0') // Loop until you hit the NULL terminator
        {
                a++;
                printf("%p\n", a);
        }

        // A now points to the end of the string.  Writing to the end
        // will add to the end.

char arraya[64]="abcdefg";
char arrayb[64]="qwerty";

int a=0;
int b=5;

printf("%c\n", arraya[a]);
printf("%c\n", arrayb[b]);

// Altering a does not alter arraya, just a!
a=b;