Ndtyjky

I have created this very simple program. My goal is to have the output say String: hello world James but I want the hello world to be malloced in my test_function. Can someone explain to me how I can make my_intro = "hello world" and name my_name = "James". This problem is revolves around how I can parse the malloc-ed char value back to my main function. This is not a duplicate of changing ints. This is parsing char *

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



void test_function(char *a_intro, char *a_name);



int main(void) {

    char *my_intro;

    char *my_name;

    test_function(my_intro, my_name);



    printf("String: %s %sn", my_intro, my_name);

}



void test_function(char *a_intro, char *a_name) {



    char *intro = malloc(20);

    char *name = malloc(20);

    strcpy(intro, "hello world");

    strcpy(name, "James");



    a_intro = intro;

    a_name = name;



}

But the error I get is:

testcode.c: In function 'main':

testcode.c:10:5: error: 'my_intro' is used uninitialized in this function [-Werr

or=uninitialized]

     test_function(my_intro, my_name);

     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

testcode.c:10:5: error: 'my_name' is used uninitialized in this function [-Werro

r=uninitialized]

cc1.exe: all warnings being treated as errors

Another possible solution which doesn't work:

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



void test_function(char *a_intro, char *a_name);



int main(void) {

    char *my_intro;

    char *my_name;

    test_function(&my_intro, &my_name);



    printf("String: %s %sn", my_intro, my_name);

}



void test_function(char *a_intro, char *a_name) {



    char *intro = malloc(20);

    char *name = malloc(20);

    strcpy(intro, "hello world");

    strcpy(name, "James");



    *a_intro = intro;

    *a_name = name;



}

Error:

testcode.c: In function 'main':

testcode.c:10:19: error: passing argument 1 of 'test_function' from incompatible

 pointer type [-Werror=incompatible-pointer-types]

     test_function(&my_intro, &my_name);

                   ^

testcode.c:5:6: note: expected 'char *' but argument is of type 'char **'

 void test_function(char *a_intro, char *a_name);

      ^~~~~~~~~~~~~

testcode.c:10:30: error: passing argument 2 of 'test_function' from incompatible

 pointer type [-Werror=incompatible-pointer-types]

     test_function(&my_intro, &my_name);

                              ^

testcode.c:5:6: note: expected 'char *' but argument is of type 'char **'

 void test_function(char *a_intro, char *a_name);

      ^~~~~~~~~~~~~

testcode.c: In function 'test_function':

testcode.c:22:14: error: assignment makes integer from pointer without a cast [-

Werror=int-conversion]

     *a_intro = intro;

              ^

testcode.c:23:13: error: assignment makes integer from pointer without a cast [-

Werror=int-conversion]

     *a_name = name;

             ^

cc1.exe: all warnings being treated as errors