#include <stdio.h>
#include <string.h>

int main() {
    char src[40], dest[12];

    memset(dest, '\0', sizeof(dest));
    strcpy(src, "hello how are you");
    strncpy(dest, src, 10); //9 for string, 1 for the \0

    printf("show src: %s(length: %ld)\n", src, strlen(src)); //size_t = ld/long unsigned int
    printf("show dest: %s(length: %ld)\n", dest, strlen(dest));


    //strcat
    char string1[] = " my friend";
    char input[80];

    printf("enter a message to be concatenated: ");
    scanf("%s", input);
    printf("%s\n", strncat(input, string1, 5));

    //strcmp
    printf("strcmp(\"A\", \"A\") is %d\n", strcmp("A", "A"));
    printf("strcmp(\"A\", \"B\") is %d\n", strcmp("A", "B"));
    printf("strcmp(\"apple\", \"Apple\") is %d\n", strcmp("apple", "Apple"));
    printf("strcmp(\"Apple\", \"apple\") is %d\n", strcmp("Apple", "apple"));
    printf("strcmp(\"apple\", \"apple\") is %d\n", strcmp("apple", "apple"));

     if(strncmp("Jieun", "Jie", 3) == 0)
    {
	printf("3 chars of \"Jieun\" and \"Jie\" is same\n");
    }

      if(strncmp("Jie", "Jieun", 3) == 0)
    {
	printf("3 chars of \"Jie\" and \"Jieun\" is same\n");
    }
    
    
    return 0;
}