CMSC104

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Lecture 26: String Functions

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Reading Assigned: None

Homework Due:  Homework 12

Homework Assigned: None

Classwork Assigned:  Classwork 15

Topics Covered:

• Homework 12 review
• Quiz 4 - Any questions for me to review?
• Quiz 5 next Monday study guide
• String functions
  • The C standard library has many functions to operate on strings
  • You can use "man" to find out more, type the command "man string.h"
  • You can also look online
  • Some interesting functions:
    • strstr - find a string in a another string
    • strcpy - make a copy of a string
    • strncpy - make a copy of a string (safe version, limits size) example
    • strcat - concatanate (append) a string to another string example
    • strlen - find the length of a string (0 = no characters, 1 = 1 character, etc.)
  • Almost all of these functions take and return character pointers
  • How would we implement strlen?
  • How would we implement strcpy?
  • How would we implement strncpy?
  • How does strstr work? How would we implement it?
  • How would we use the return value of strstr?
  • How does strtok work?