1. Strings and Pointer Arrays
Speaker: Yao-Ting Huang
Advisor: Kun-Mao Chao
National Taiwan University
Department of Computer Science & Information Engineering
Algorithms and Computational Biology Lab.
2019/2/24

2. Pointer Arrays (1/2)
A pointer variable contains the memory address where the actual value is stored.
“char *a” declares a char pointer which points to the initial memory address of a string.
You can represent strings by arrays or pointers.
e.g., “char n[]” is the same as “char *n”
An array of strings can be represented by an array of char pointers.
e.g., int main(int argc, char *argv[])
argv[0] <=> char* <=> a string;
argv[1] <=> char* <=> a string;

3. Pointer Arrays (2/2) “char argv[]” is an array of char.
“char *argv[]” is an array of strings.
When your program is invoked, the input arguments are passed to the main function as an array of strings.
e.g., “C:\Run parameter1 parameter2”
“char *argv[]” stores all the input arguments.
Since each array element is a char pointer (i.e., a string), we can print each input argument by
fprintf(“%s\n”, argv[0]);
fprintf(“%s\n”, argv[1]);

4. Final Project You have to join a group composed of 5 to 7 people.
Please hand in the list of group members and to both TA.
TAs will discuss with each individual group at 12/9 and 12/23.
Each group should submit your proposal for final project by 12/2.
Each group should present your proposal at that day.
TA will correct your proposal in your presentation.
The students in both class A and class B should attend the class in PM 1:20.

5. Outline of Lecture Today
Demo of your Homework #5.
Please make sure your program is ready to execute.
Reform the project groups.