Write a few litle c++ programs

Those are the tasks which should be finished, code should be pasted in this text. For the tasks which require to list errors, please use // comments 6. (4 points) List the errors in the code below. int *p1 , p2 , &p3; p2 = 5; *p1 = &p2; cout << &p1 << endl ; 7. (4 points) List the errors in the block of code below. int mat [][5]; for(int i = 0; i < 5; i++) { mat [i] = 7; } cout << mat [i][i] << endl ; 8. (7 points) What does the following block of code print? Show how you calculated the result. int a [10]; for(int i = 0; i < 10; i++) a[i] = 9-i; for(int i = 0; i < 10; i++) { a[i] = a[a[i]]; cout << a[i] << " "; } 9. (8 points) What does the following program print? Show how you calculated the result. int fun(int x, int y, int z) { if(x <0 || z >10) return y +1; else return fun(x -1, y, z) + fun (x, y, z +2); } int main () { cout << fun (1, 2, 7)<< endl ; return 0; } 10. (6 points) Write a programm which as input takes two real numbers x and y and calculates x to the power of y. Make sure that both numbers are positive. 11. (16 points) Write a program which asks a user for a number n not larger than 20. Program then creates a matrix of size n times n and fills it with random numbers in range from 0 to 3n. Matrix is then printed. Finally, index of the row which has a smallest sum of elements is printed. 12. (16 points) While generating a password by selecting random characters generally gives a relatively secure password, it also generally gives a password that is difficult to memorize. As an alternative, some systems construct a password by taking two English words and concatenating (joining) them. While this password is not as secure, it is much easier to memorize. Write a program that reads a file named words.txt. The first line of the file holds the total number of words in a file. Other lines hold a single word. For testing you can create this file yourself with some words in it. Program randomly selects two of them, and concatenates (joins) them to produce a new password. When producing the password ensure that the total length is between 8 and 10 characters, and that each word used is at least three letters long. Capitalize each word in the password so that the user can easily see where one word ends and the next one begins. Display the password for the user. 13. (14 points) Write a function which checks if two strings are anagrams. Function needs to ignore difference between capitalized and non capitalized letters as well as punctuation. Two strings are said to be anagrams if letters of one can be rearranged so they form second string. For example, string "A decimal point!" is anagram of string "I'm a dot in place". [Hints. Assume following two functions are available. Function bool isalpha(char c) returns true if char c is a letter, and false if it is some other character. Function int toupper(char c) returns capitallized letter which is in variable char c. Letter "A" is at 65th position of ASCII table.] 14. (10 points) Given a number n, compute recursively number of the occurrences of 8 as a digit, with special case where an 8 with another 8 immediately to its left counts double, so 8818 returns 4. More examples: 8 returns 1; 5858 returns 2; 58888 returns 7. For partial credit (5 points) simply count number of eights recursively. [Hints. Mod (%) by 10 yields the rightmost digit (126 % 10 is 6), while divide (/) by 10 removes the rightmost digit (126 / 10 is 12).]