C - error storage size of a isn t known

Question

This is my C program      include  lt stdio h gt   struct xyx       int x      int y      char c      char str 20       int arr 2       int main void        struct xyz a      a x   100      printf   d n   a x       return 0      This is the error that I am getting      Press ENTER or type command to continue   13structtest c  In function    main     13structtest c 13 13  error  storage size of    a    isn   t known 13structtest c 13 13  warning  unused variable    a     -Wunused-variable

User · Answer

you define the struct as xyx but you re trying to create the struct called xyz

User · Answer

To anyone with who is having this problem  its a typo error  Check your spelling of your struct delcerations and your struct

User · Answer

Your struct is called struct xyx but a is of type struct xyz  Once you fix that  the output is 100    include  lt stdio h gt   struct xyx       int x      int y      char c      char str 20       int arr 2       int main void        struct xyx a      a x   100      printf   d n   a x       return 0

User · Answer

Say it like this  struct xyx a

User · Answer

1 declare the structs before the main function  it worked for me  2  And also fix the spelling mistake of that variable name if any e

User · Answer

correct typo of   struct xyz a    to   struct xyx a    Better you can try typedef  easy to b

User · Answer

You define your struct as xyx  however in your main  you use struct xyz a    which only creates a forward declaration of a differently named struct   Try using xyx a  instead of that line

User · Answer

In this case the user has done mistake in definition and its usage  If someone has done a typedef to a structure the same should be used without using struct following is the example   typedef struct      int a   studyT    When using in a function   int main        struct studyT study     This will give above error     studyT stud     This will eliminate the above error     return 0

[c] C - error: storage size of ‘a’ isn’t known

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