consider the lines of code below. Indicate which are invalid, meaing either that

Question

consider the lines of code below. Indicate which are invalid, meaing either that they would not compile or that they may produce a memory fault. consider each line independently of all others.

struct passport {
char last[10];
int number;
float fees;
double *country_code;
};
struct passport list[3],*passenger;
char who[7],a,*b;
double *d,d2;

b="Hello';
list->country_code=277;
list[0].country_code=d;
list[2].country_code=&d2;
*(list[3].country_code)=277;
passport.country_code=463;
passenger=&passport;
who[6]='a';
a=5;
b=&(list[0].last[5]);
passenger=&list;
passenger=&(list[0]);list[2]=(*passenger);
list[0].fees="world";
list[0].fees='p'+0.65;
*(passenger->country_code)=*d=(double)(list[0].last[12]);

Explanation / Answer

(b="Hello";) This is fine. (list->country_code=277)ERROR, country code is a pointer. must dereferance country code before assigning it a value. (List[0].country_code=&d2;) This is fine (*list[3].country_code)=277;) This is fine (passport.country_code=463;) ERROR, replace passport with list[x] or passenger (passenger=&passport;) ERROR, theres alot wrong with this one. mainly &passport. (who[6]='a';) This is fine (a=5;) ERROR, a is char (b=&(list[0].last[5]);) This is fine. (passenger=&list;) ERROR, fix by writing passenter=&list[x] (passenger=&(list[0]);list[2]=(*passenger);) These are both fine (list[0].fees="world";) ERROR, fees is a float not a char * (list[0].fees='p'+0.65;) This is fine since compiler will convert 'p' to int (*(passenger->country_code)=*d=(double)(list[0].last[12]);) ERROR, last is char not double. Hope that helps

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