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Typedef - Programming

Q1:

Is there any difference in the #define and typedef in the following code? 
typedef char * string_t;
#define string_d char *;
string_t s1, s2;
string_d s3, s4;

A Yes

B No

ANS:A - Yes

In these declarations, s1, s2 and s3 are all treated as char*, but s4 is treated as a char, which is probably not the intention.