Recursion can be used to do both tasks in one line. Below are one line implementations for stracat() and strcmp().
/* my_strcat(dest, src) copies data of src to dest. To do so, it first reaches end of the string dest using recursive calls my_strcat(++dest, src). Once end of dest is reached, data is copied using (*dest++ = *src++)? my_strcat(dest, src). */ void my_strcat( char *dest, char *src) { (*dest)? my_strcat(++dest, src): (*dest++ = *src++)? my_strcat(dest, src): 0 ; } /* driver function to test above function */ int main() { char dest[100] = "geeksfor" ; char *src = "geeks" ; my_strcat(dest, src); printf ( " %s " , dest); getchar (); } |
The function my_strcmp() is simple compared to my_strcmp().
/* my_strcmp(a, b) returns 0 if strings a and b are same, otherwise 1. It recursively increases a and b pointers. At any point if *a is not equal to *b then 1 is returned. If we reach end of both strings at the same time then 0 is returned. */ int my_strcmp( char *a, char *b) { return (*a == *b && *b == ' |