🤖 Project 4 due Saturday, Feb 19th (9PM)
this week’s slides: bit.ly/cs31w22_week6
prior slides (arrays): bit.ly/cs31w22_week5
credit: nikki woo+zhehui+rosemary
A way to represent strings without using C++ string library Need some way to tell how big the cstring is --> add '\0' to end of cstring
#include <iostream>
#include <cstring> // contains functions to manipulate cstrings
using namespace std;
// need to have s[20] because need to account for zero byte at end
char s[20] = "Megan Thee Stallion";
// Megan Thee Stallion\\0
// 0123456789012345678 9
// 111111111 1
// convention for looping through a cstring, check that current char
// is not the zero byte at the end
for (int k = 0; s[k] != '\\0'; k++) {
cout << s[k];
}
// for cstrings, you can also do this
cout << s << endl; // will write out string up to (not including) '\\0'
// how to get a user input and store into cstring
char user_input[100];
cin.getline(user_input, 99); // 99 because need to make room for nullbyte!
// to copy a cstring
strcopy(user_input, s); // copy s INTO user_input
// get length of cstring
int len = strlen(s); // will return 19 --> count of chars not including '\\0'
// concaternate cstrings
strcat(s, " :)");
cout << s << endl; // Megan Thee Stallion :)
// compare cstrings (can't use <, >)
int result = strcmp(s, user_input);
// result negative if s < user_input
// result = 0 if s == user_input
// result positive if s > user_input
<aside> 🚫 No extra array allocations should be necessary. So use loops and do it a different way.
</aside>