cs210-ps1-part a-p2

#include <stdio.h>

char DNA[] = "ATCATCTC";

char *tptr;

int tcnt;

int len;

int process() {

int found = 0;

if (tptr == NULL) return 0;

while (*tptr) {

printf("*tptr first time come is: %c with ASCII %d\n", *tptr, *tptr);

len++;

if (*tptr == 'T') {

printf("if, *tptr == 'T', *tptr is: %c with ASCII %d\n", *tptr, *tptr);

tcnt++;

found = 1;

} else {

printf("else, Before *tptr = 'a' + (*tptr - 'A'), *tptr is: %c with ASCII %d\n", *tptr, *tptr);

*tptr = 'a' + (*tptr - 'A');

printf("else, After *tptr = 'a' + (*tptr - 'A'), *tptr now is: %c with ASCII %d\n", *tptr, *tptr);

}

tptr++;

printf("!! after tptr++, it is %s %c \n", tptr, *tptr);

if (found) {

printf(found ? "found is true\n" : "found is false\n");

return 1;}

}

return 0;

}

int idx() {

printf ("for idx(): DNA=%s tptr=%s tptr - DNA = %d\n", DNA, tptr, tptr-DNA);

return (tptr) ? (tptr-DNA) : -1;

}

int main(int argc, char **argv) {

tptr = DNA;

tcnt = 0;

len = 0;

while (process()) printf("%d\n\n", idx());

printf("DNA:%s Tptr:%s\n tcnt:%d len:%d\n", DNA, tptr, tcnt, len);

return 0;

}