Assignment7

Objectives

To gain an understanding of pointers.

Part 1

1. In a program reverse.c, write a string reversal function using pointers that takes only a string as input, creates 2 pointers, performs a string reversal using those pointers, and prints out the reversed string. Your driver should take a string input by the user using fgets().

Part 2

In a text file assignment7.txt, answer the following questions:

1. Explain the difference between ++*p, *p++ and *++p, if there is any.
2. Is the left to right or right to left order guaranteed for operator precedence?
3. What are the advantages of using pointers?
4. Consider a C program’s main() function that starts as follows:

    int main(int argc, char **argv) {
      int a[10] = { 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
      int *p = a + 2;
      char *str = "hello";

• For integer expressions (i.e., the expressions whose types are char, short, int, size_t, long, or long long--either signed or unsigned), write the actual number value.

• For non-integer expressions, write the type name, in the format that you use to declare a variable of that type. Some example type names include but are not limited to:

    int *
    double
    double **
    int(*)(int)

• Write "invalid" if a given expression is not a valid C expression.

• Make sure sure to explain each of your answers.

4.1 "abc"
4.2 "xyz"[1] - ’y’
4.3 ’\0’ == 0
4.4 *a
4.5 &a[0]
4.6 *p
4.7 &p
4.8 *++argv
4.9 &main
4.10 sizeof(str)

Part 3:

Submit your final project proposal in the "Final Project" Repository.

Submission Guidelines

Please include your name and a description in a comment at the top of your code files. Please also include your name at the top of your assignment7.txt file.

All files must be submitted via GitHub by 10:00am 7/11.