gets is deprecated for security reasons, because it can't protect against a buffer overflow. Man page says "Never use this function." fgets is recommended instead.

So I used:

int main ()
{
	char s[100];
	fgets(s, sizeof(s), stdin);
	printf("Hello, World!\n%s", s);
	
	return 0;
}

include

int main() { char str[100]; gets(str);

printf("Hello, World.\n"); printf("%s",str);

return 0;

}

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

[^\n]-prints whole string for example in "hello guys" only hello will be printed but after [^\n] whole string will be printed considering space.

Why is this wrong? The expected output is identical to what I'm getting.

int main() 
{
    char s[100];
    fgets(s, sizeof(s), stdin);
    
    printf("Hello World!\n%s", s);
    return 0;
}

include

include

int main () { char s[100]; fgets(s, sizeof(s), stdin); printf("Hello, World!\n%s", s);

return 0;

}