C中带有字符串的函数的头文件

Question

main.c is my piece of code that takes the header file test.h and my test.h and test.c files as follows. I am not able to compile and execute this. Where am I going wrong?

#ifndef TEST_H_
#define TEST_H_

char test(void);

#endif

is my test.h

 #include "test.h"

  char test(void)
 {
   return "abcd";
 }

is my test.c file

#include <stdio.h>
#include "test.h"

int main(){

   char z = test();
   printf("%s\n",z);
   return 0;
  }

is my main.c file.

Answer 1

"char test(void);" should be: "char* test(void);

"char z" should be: "char* z"

You are returning a char array (technically a pointer to the start of the array) from test() not a single char.

Edit just compiled and it works

#ifndef TEST_H_
#define TEST_H_

char* test(void);

#endif

is the new test.h

 #include "test.h"

  char* test(void)
 {
   return "abcd";
 }

is the new test.c file

#include <stdio.h>
#include "test.h"

int main(){

   char* z = test();
   printf("%s\n",z);
   return 0;
  }

is the new main.c file.