Where are the program variables stored in memory(text, data or stack segments)

Hi All,
Suppose I consider a sample program as given below:-

#include<stdio.h>
#include<stdlib.h>
int i;
int main()
{
char *test(int i);
char *tmp = NULL;
i = 10;
tmp = test(i);
printf("%s\n", test(i));
free(tmp);
return 0;
}


char *test(int i)
{
char *str = (char*)malloc(20);
sprintf(str, "i value is: %d", i);
return str;
}

This program contains several variables (global, local and dynamically
allocated variables).
How to figure out which variable is stored in which segment viz. text,
data, stack or heap? Is there any tool to get an idea about it?

Thanks and Regards,
kr.
.

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