how to return a char array from a function in C

Question

I want to return a character array from a function  Then I want to print it in main  how can I get the character array back in main function    include lt stdio h gt   include lt string h gt  int main         int i 0 j 2      char s    String       char  test       test substring i j  s          printf   s  test       return 0      char  substring int i int j char  ch        int m n k 0       char  ch1      ch1  char  malloc  j-i 1  1       n j-i 1       while k lt n                   ch1 k  ch i           i   k                  return  char   ch1      Please tell me what am I doing wrong

User · Answer

Daniel is right  http   ideone com kgbo1C view edit box  Change  test substring i j  s     to  test substring i j s       Also  you need to forward declare substring   char  substring int i int j char  ch    int main

User · Answer

include lt stdio h gt   include lt string h gt   include lt stdlib h gt  char  substring int i int j char  ch        int n k 0      char  ch1      ch1  char  malloc  j-i 1  1       n j-i 1       while k lt n                ch1 k  ch i           i   k               return  char   ch1     int main         int i 0 j 2      char s    String       char  test       test substring i j s       printf   s  test       free test     free the test      return 0      This will compile fine without any warning    include stdlib h  pass test substring i j s    remove m as it is unused  either declare char substring int i int j char  ch  or define it before main

User · Answer

Lazy notes in comments    include  lt stdio h gt     for malloc  include  lt stdlib h gt      you need the prototype char  substring int i int j char  ch     int main void    std compliance         int i 0 j 2    char s    String     char  test       s points to the first char  S       s  is  the first char  S   test substring i j s      so s only is ok      if test    NULL  failed  give up   printf   s  test     free test      you should free it   return 0      char  substring int i int j char  ch      int k 0       avoid calc same things several time   int n   j-i 1     char  ch1       you can omit casting - and sizeof char     1   ch1 malloc n sizeof char         if   ch1  error     return NULL        any kind of check missing       are i  j ok        is n  gt  0    ch i  is  inside  the string       while k lt n                 ch1 k  ch i         i   k                return ch1

[c] how to return a char array from a function in C

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