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

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;

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]);

Final Project You have to join a group composed of 5 to 7 people. Please hand in the list of group members and email 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.

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