String

#include <string.h>

Character Array

In C, there is no built-in string type. As an alternative, we use character arrays to represent a string:

char name[] = "Danny";

Although the length of Danny is 5, there is an invisible character '\0' at the end, which C uses to indicate the end of the character array. Hence, the size of name array is actually 6.

Just like normal arrays, you can initialize char arrays using {} (note that here, we have to a xx'\0' character by ourselves):

char day[] = {'2', '4', '-', '0', '7', '-', '2', '0', '2', '0', '\0'};

Then you can print the character array using a loop:

int i = 0;
while (day[i] != '\0') {
    // i++ is post-increment,
    // that means it returns the original value of i,
    // before adding 1 to i
    printf("%c", day[i++]);
}

printf("\n");

strlen()

TODO:

strcpy()

TODO:

strcmp()

TODO: