C hello world program is crashing on variable output

Question

To start off, I'm coming off from ac# background, so I do have a knowledge on intermediate programming.

So this is my first C program, and when I try to print the variable "testtt" it crashes.

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char testtt = "Hello world";
    //scanf("%s", &test);
    printf(testtt);
    return 0;
}

Answer 1

char only holds one character. Use char testtt[] = "Hello world";

Answer 2

Change

char testtt = "Hello world";

to

char testtt[] = "Hello world";

Answer 3

我认为printf也应该是：

printf("%s", testtt);