CS221: C and Systems Programming Fall 2019 - Lab 9.1 (Solved)
computer science
Description
CS221: C and Systems Programming Fall 2019 - Lab 9.1
Consider
the following data structure from lecture for store usernames and passwords:
In main() function,
creds has already been initialized. Complete the
following functions. You may not use any [] in any function.
#define
NUM_OF_USERS 10 #define MAX_USER_INPUT_SIZE 100
void addUser(const char* username,
const char* password, int* user_count, char creds[][NUM_OF_USERS][MAX_USER_INPUT_SIZE])
{
//Your code goes here..
}
int
getUserIndex(const char* username, char
creds[][NUM_OF_USERS][MAX_USER_INPUT_SIZE], int user_count)
{
//Your code goes here..
}
void
replaceSecondChar(char new_char, const char* username, int user_count, char
creds[][NUM_OF_USERS][MAX_USER_INPUT_SIZE]) { //Your code goes here..
}
void printAll(char
creds[][NUM_OF_USERS][MAX_USER_INPUT_SIZE], int user_count)
{
//Your code goes here..
}
int
main(void) { char creds[2][NUM_OF_USERS][MAX_USER_INPUT_SIZE]; int user_count =
0; //no users in the database yet.
addUser("admin",
"s#1Pa5", &user_count, creds); addUser("vahab",
"fgH!12", &user_count, creds);
replaceSecondChar('@',
"vahab", user_count, creds);
printf("The total
number of users: %d\n", user_count);
printAll(creds, user_count);
return 0;
}
1.
addUser adds a new user
with username and password (appends
to the end).
2.
getUserIndex returns the index
of the user with given username. If no user with
username is found, it returns -1.
3.
replaceSecondChar replaces the
second char of a user’s username to new char,
only for the user with given username.
4.
printAll prints all
usernames with their corresponding passwords. Below is the output of printAll:
username:
admin, password: s#1Pa5 username: vahab, password: fgH!12
Lab Check-off
• Show
your TA the output of your main function.
• Show
your TA the body of your addUser and replaceSecondChar
functions.
