Q6 Common Mistakes in C

5 Points

Each of the following code samples below is making a common mistake in C. From the options:

probable segfault, double free, incorrect use of free, logic error, memory leak, and no error

select the error type that best categorizes the mistake.

You can assume all the code has the necessary #include macros. Also you should assume that the system is 32-bit.

1) #DEFINE PASSWORD "correct horse battery staple" char *check_permissions (char *user_guess) { if (user_guess = PASSWORD) { return "access granted"; } return "access denied"; } 

2) #DEFINE PASSWORD "correct horse battery staple" char *check_permissions (char *user_guess) { if (user_guess == PASSWORD) { return "access granted"; } return "access denied"; } 

3) int main () { char *x = malloc(0xFFFFFFFF * sizeof(char)); x[0] = '!'; }

4) int foo () { int *x = malloc(20); x[0] = x[1] = 1; x[2] = x[0] + x[1]; x[3] = 99; return x[3]; }

5) int main () {

 char *x = "patrick"; printf("%s", x); free(x); // tidy up } 

#DEFINE PASSWORD "correct horse battery staple" char *check_permissions (char *user_guess) f if (user_guessPASSWORD) return "access granted" return "access denied"; #DEFINE PASSWORD "correct horse battery staple" char *check_permissions (char *user_guess) if (user_guess PASSWORD) return "access granted"; return "access denied"; int main )( char *x malloc (0xFFFFFFFFsizeof (char)); int foo ) int *x = malloc (20); 2 + X x[3]99; return x[3]; int main ) char *x "patrick"; printf ( " %s " , x ) ; free(x): 17 tidy up