In your Main. storyboard Add a
Using stack view, add 17 buttons:
Numbers 0 through 9 (10 buttons)
Decimal point (.) (1 button)
Operations (+, -, *, /) (4 buttons)
Equality sign (=) (1 button)
All clear (AC) to clear the functions/contents in the label (1 button)
In your ViewController. swift file add appropriate outlets and actions to your above created objects.
All the buttons should have appropriate text and action. For example: Numbers should append appropriate number to the label, Equality sign should replace the label content with the result.
Your label must show the entire expression before the result is calculated (i. e. before the equality button is tapped.)
For example: With this sequence of button taps, 1, + and 2, your label must show "1", "1+" and "1+2" for each corresponding button tap. The label must be replaced with "3" when tapped on =.

Change the background color of the label depending on the result
If the result is negative, change the background color of the label to
Since you will be converting the label string into an expression and perform the calculation, you will get errors for improper expressions. Handle that error, set the result in the label to 0 and change the background of the label to
For a calculated non-negative result, the background color of the label should be a default color (same color when the app is launched). The default is usually white, but you can choose any color other than black and
Make sure the text within the label is visible when the background color is changed (i. e. change the text color appropriately if the text is )

Computer security/cybersecurity1) each of the following code fragments contains a number of security vulnerabilities. for each fragment, identify these security vulnerabilities and, for each vulnerability, discuss at least one way that it could be improved. note that in your discussion of how each vulnerability could be improved, you do not need to re-write a new version of the program in c; simply discuss your solution, either in pseudocode or in 1-2 sentences.a) /* file descriptor leak */#include #include int main(int argc, char *argv[]){ char *filepath = argv[0]; char *shellpath = argv[1]; file *passwords; passwords = fopen(filepath, "r"); /* read the password and do something with it */ /* . . */ /* fork and execute alternative shell */ execl(shellpath, "shell", null); }b)#include /* assume the following function is written for an electronic storefront. the user will enter the id of the item to be ordered, as well as the quantity of units that they would like to purchase. the program will then lookup the price for the price for the item using a predefined function, and return the total cost of the order.*/int gettotalcost(){ char itemid[9]; int price, unitsordered, cost; printf(" enter the 9-digit id of the item to be ordered: "); scanf("%s", & itemid); /* lookup the price according to the itemid */ price = getpricebyid(itemid); printf(" enter the quantity of units to be ordered: "); scanf("%d", & unitsordered); cost = price * unitsordered; return cost; }c)#include /* the following function is intended to return a user's full name by concatenating the user's first and last name into a single string and then returning that string. */char *getfullname(char *firstname, char *lastname, int max_len){ char fullname[max_len]; strcpy(fullname, firstname); strcat(fullname, " "); strcat(fullname, lastname); return fullname; }d)#include /* the following code snippet runs through the list of cli arguments entered and displays them to the console. */int main(int argc, char *argv[]){ int i; printf("you've entered the following arguments: "); for(i = 0; i < argc; i++){ print(argv[i]); printf("\n"); } /* */}