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 == '\0')? 0 : (*a == *b)? my_strcmp(++a, ++b): 1; } /* driver function to test above function */ int main() { char *a = "geeksforgeeks"; char *b = "geeksforgeeks"; if(my_strcmp(a, b) == 0) printf(" String are same "); else printf(" String are not same "); getchar(); return 0; }
The above functions do very basic string concatenation and string comparison. These functions do not provide same functionality as standard library functions.
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