1. Write a function in C that takes two integers as arguments and returns the largest of the two.

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int max(int a, int b) {    if (a > b) {        return a;    } else {        return b;    } }

1. Write a function in C that takes an array of integers and its size as arguments, and returns the sum of all the elements in the array.

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int sumArray(int* arr, int size) {    int sum = 0;    for (int i = 0; i < size; i++) {        sum += arr[i];    }    return sum; }

1. Write a function in C that takes a string as an argument and returns the number of vowels in the string.

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int countVowels(char* str) {    int count = 0;    for (int i = 0; str[i] != '\0'; i++) {        if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' || str[i] == 'o' || str[i] == 'u' ||            str[i] == 'A' || str[i] == 'E' || str[i] == 'I' || str[i] == 'O' || str[i] == 'U') {            count++;        }    }    return count; }

1. Write a function in C that takes a positive integer as an argument and returns the factorial of that number.

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int factorial(int n) {    if (n == 0) {        return 1;    }    return n * factorial(n - 1); }

1. Write a function in C that takes an array of integers and its size as arguments, and sorts the array in ascending order using the bubble sort algorithm.

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void bubbleSort(int* arr, int size) {    for (int i = 0; i < size - 1; i++) {        for (int j = 0; j < size - i - 1; j++) {            if (arr[j] > arr[j + 1]) {                int temp = arr[j];                arr[j] = arr[j + 1];                arr[j + 1] = temp;            }        }    } }

Please note that these are just sample solutions to the problems, and there are many ways to solve a problem in C. Also, these problems are not meant to be difficult, the goal is to give you an idea of how functions work in C and how they can be used to solve problems.