printf is only printing "1537" rather than the value of the integer

printf is only printing "1537" rather than the value of the integer

I'm just now learning programming, so this might seem a tiresome question.
But when I try to print the value of an integer, it prints "1537" instead.
Here is the function, feel free to scrutinize.
void compare(void) {
int num1;
int num2;
int num3;
int num4;
int smallest;
printf("Please enter four integers:\n");
scanf("%d %d %d %d", &num1, &num2, &num3, &num4);
num1 = smallest;
if (num2 < smallest)
num2 = smallest;
if (num3 < smallest)
num3 = smallest;
if (num4 < smallest)
num4 = smallest;
printf("%d is the smallest\n", smallest);
}