1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | /* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
#include <stdio.h>
int strlen(char* s) { // returns the length of the string, not including the '\0'
// expect about 2-6 lines of code here
}
int main(int argc, char *argv[]) {
// A string is an array of characters.
// A string literal ("...") automatically has a '\0' appended to it.
// '\0' is called the null terminator, and its value is 0.
char s1[3]; // declare array of 3 characters
//s1[0] = "H"; // BAD
s1[0] = 'H'; // GOOD
s1[1] = 'i';
s1[2] = '\0'; // without this, we would have bugs
char s3[] = "Hi"; // you don't need to add the '\0' when using "..."
char* s4 = "Hi"; // s4 is the address of the first character, 'H'
char s2[] = {'H', 'i', '\0'};
char s6[] = {0x48, 0x69, 0x00};
char s5[] = {72, 105, 0};
char s7[] = {72, 1105, 0};
return 0;
}
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