Problem 1. Describe, in English, the language defined by the following grammar: + a | a + b b + c C Problem 2. Write a grammar for the language consisting of strings that have n copies of the letter "a" followed by the same number of copies of the letter "b", where n > 0. For example, the strings "ab", "aaaabbbb", and "aaaaaaaabbbbbbbb" are in the language but "a", "abb", and "aaabb" are not. Problem 3. Consider the following C-like program: int fun(int *i) { *i += 5; return 4; void main() { int x = 3; x = x + fun(&x); What is the value of "x" after the assignment statement in main, assuming a. Operands are evaluated left to right. b. Operands are evaluated right to left