programing c

3. (15 pts) Declare a character array of size 10. Write a loop to initialize the array with consecutive letters starting at the letter D 4. (10 pts) Declare a two-dimensional int array of size 4x 8 (row x column) and initialize the first element of every row to 6 and the remaining elements to O at the same time of declaration. Use as short statement wherever possible The following problems are assigned for Lecture 23 Functions L. Do them after the lecture. 5. 15 pts) Write a function called tolowerCase that takes a character variable letter as input and returns it into lowercase. If letter is already lowercase or a number from 0 to 9, do not change t. For example, if letter is 'A', return 'a. If letter is 'a' or 'O, return the same letter. 6. (15 pts) What is the output of the following program? Explain how you get the value. #include int expand(int number, int factor) retum number factor int main(void) ( int x-3 printf("%d %an", expand(x + 1, 41, expand(expand(x+2, 3),-3) ); return 0