i wrote this code corrwhy it gives error

I write this coad as i am a beginner, my output and expected output is same but still it show an error, can anyone tell me why???

include

int main() { char str1[] = "Hello, world!"; char str2[] = "Welcome to C programming."; printf("%s\n", str1); printf("%s\n", str2); return 0; }

Here is Hackerrahnk "Hello World!" in C solution

include

include

include

include

int main() {

char s[100];
scanf("%[^\n]%*c", s);

printf("hello,world!\n");
scanf("%s\n",s);
return 0;

}

Here is problem solution - Plugged IN not charging in laptop