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![Cstring equivalents
#include <cstring>
Cstrings are declared as char cs[] = ….
strlen(cs); //returns the length of cs
strcat(cs1,cs2); //concatenates two
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Uploaded byMichael Gordon
Strings2
This document discusses string manipulation functions in C++, including getting substrings using .substr(), inserting into strings with .insert(), finding substrings with .find(), comparing strings with relational operators, and equivalent functions for C-style strings like strlen() and strcat(). It provides examples of using .substr() to extract substrings by index and length, .insert() to add a substring, and .find() to locate a substring. It also notes that string comparisons consider ASCII values, so uppercase letters appear before lowercase.
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- 1. CS111 Lab Strings, continued Instructor:Michael Gordon
- 2. Substrings Use .substr()to get a substring First parameter is starting index, second (optional) is the number of characters in the substring. (By default it is all of them.) string s = “Ronald”; cout<<s.substr(0); //prints Ronald cout<<s.substr(0,3); //prints Ron cout<<s.substr(1,2); //prints on
- 3. Insert and find string s = “AM”; string s1 = s.insert(1,”DA”); Inserts “DA” into s starting at position 1. cout<<s1; //prints ADAM s.find(“AD”); //value of first position
- 4. Comparison Use ==,<, >, !=, <=, >= Comparison is on ASCII value, so ‘A’ < ‘a’, (‘A’ == 65 and ‘a’ == 97), so comparisons are most useful on all lower-case or all upper-case strings. A useful tool is the toupper(c) is a function that takes a char parameter and returns the uppercase version.
- 5. Cstring equivalents #include<cstring> Cstrings are declared as char cs[] = …. strlen(cs); //returns the length of cs strcat(cs1,cs2); //concatenates two cstrings