Write a C function that takes as input an integer number, n, and displays the sum of integer numbers from 1 to n-1. For example, n= 5, output: 10 (4+3+2+1) Write a C function that takes as input an integer number, n, and displays all the positive factors of n (excluding n itself) and returns the sum of them. For example: n=12, Output = 1, 2, 3, 4, 6 return 16. Write a C function that takes as input an integer number, n, and converts it to a string and display it. Write a C function that takes two input parameters, an array of characters (a string), and its size (integer). and returns 1 if the first character of the given string is uppercase, returns 0 if it is lowercase, and returns - 1 if it is a digit. Write a function that takes an integer as input and returns the sum of all its digits. Write a program to read input values for an integer array of size 15 and display the second largest integer value in the array. Write a C function that takes as input an integer and returns 1 if it is odd and returns 0 if it is even. Write a C program to read a lowercase character and convert it into the corresponding uppercase character. Write a C function that takes two string arrays as input and returns 1 if they are equal and otherwise returns 0. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal in the same order. Write a C program that reads ten integer numbers from the user and stores them in an array of size 10. Then counts and displays the sum of the odd numbers which are in the even index positions of the array. Write a C function, distance, that receives four double floating-point numbers, x1, y1, x2, and y2. This function should compute and return the custom distance of two points with the coordination (x1, y1) and (x2, y2), using the equation d = (x2-x1)5+ (y2-y1)5.