Miscellaneous C Questions

1. How to find if a stack is progressing in forward or backward
direction using a C program?

//This code relies on the fundamental idea that function calls uses stack.

#include<stdio.h>
int* globalvar;
void myfunc(void);

int main()
{
        int i,*x=&i;
        myfunc();
        if((globalvar-x)>0)
                printf("stack progression forward");
        else
                printf("Stack progression backward");
}

void myfunc(void)
{
        int j;
        globalvar=&j;
        return;
}

2. How exactly are \c and \v used in C. when i give them in a printf
statement, strange characters are printed.

according to K &R, any non standard (ie., the one's for which \(char) form is not defined, the result of printing such a thing is undefined!)
for \c ->test.c:6:16: warning: unknown escape sequence '\c'
for \v -> it prints this character - ♂ !! i read here \v stands for vertical tab and is not working (in windows gcc).

3.typedef struct{
char *;
nodeptr next; //this should be nodeptr* next; (updated from algo-geeks)
} * nodeptr;
what does nodeptr stand for?

the purpose of typedef is to provide a compile time new name.
typedef int* integer_pointer; (will allow u to write integer_pointer a; , "a" now is a pointer to an integer. )
you can understand this as:
typedef (structureinfo)* newname;
this causes nodeptr to be a pointer to the anonymous structure defined above.
Although technically right, this declaration is useless!, since the structure is anonymous.
correct me if i am wrong somewhere.

-வருண்
சௌ . வருண் அங்கு ஜீஅஞ்சல் . வணிகம்
;-)