Write in C program

You are given a list of n-1 integers and these integers are in the range of 1 to n. There are no duplicates in the list. One of the integers is missing in the list. Write a code to find the missing integer. Example: Input: arr[] = {1, 2, 4, 6, 3, 7, 8} Output: 5 Explanation: The missing number from 1 to 8 is 5 Input: arr[] = {1, 2, 3, 5) Output: 4 Explanation: The missing number from 1 to 5 is 4