please answer ever question and explain why. (programming in C)

Problem 2. Section 5.1, Exercise 19. 19. Write a function echo chars with no parameters. The function echo_chars copies the standard input to the standard output and returns the number of characters copied. Problem 3. Section 5.2. Exercise 1. 1. (True/False) A function is invoked with a call statement, as in call check( guess ); Problem 4. Chapter 5.3, Exercise 3. 3. Suppose that the function fun has three arguments, fun( argi, arg2, arg3 ); /* invoking function fun */ and the three parameters, as specified in fun's header fun( char parmi, char parm2, char parm3) " fun's header Using storage cells, explain the relationship between each argument and parameter. Problem 5. Chapter 5.5, Exercise 2. 2. Explain the relationship between the variables f1 and 2 in the functions main and funi. int fun1( float pi, float p2); main() float fi, 2; char c1; int funi( float pi, float p2 ) float 1, 2; Problem 2. Section 5.1, Exercise 19. 19. Write a function echo chars with no parameters. The function echo_chars copies the standard input to the standard output and returns the number of characters copied. Problem 3. Section 5.2. Exercise 1. 1. (True/False) A function is invoked with a call statement, as in call check( guess ); Problem 4. Chapter 5.3, Exercise 3. 3. Suppose that the function fun has three arguments, fun( argi, arg2, arg3 ); /* invoking function fun */ and the three parameters, as specified in fun's header fun( char parmi, char parm2, char parm3) " fun's header Using storage cells, explain the relationship between each argument and parameter. Problem 5. Chapter 5.5, Exercise 2. 2. Explain the relationship between the variables f1 and 2 in the functions main and funi. int fun1( float pi, float p2); main() float fi, 2; char c1; int funi( float pi, float p2 ) float 1, 2