printf only displays after 'main' has resolved?

[brightmatter]

I am using the most up-to-date eclipse IDE for C/C++. I have the below code. It seems simple enough. My problem is that no printf will display on the console until the main has finished (return 0). This means I get a prompt in console asking for input before I get the message telling me what to do. I fill in a number like 10 and I see 10 is now displayed in stdout followed by the first and second printf. Can anyone explain why this is? What am I doing wrong?

#include <stdio.h>

int main(void) {
	int n = 0; /* The number of fibonacci numbers we will print */
	int i = 0; /* The index of fibonacci number to be printed next */
	int left = 1; /* The value of the (i)th fibonacci number */
	int right = 1; /* The value of the (i+1)th fibonacci number */
	int temp = 1; /* The value of the (i+2)th fibonacci number */

                printf("Enter New Index: ");
		scanf("%d", &n);
		printf("Index: %d", n);
		if (n < 0 || n == 0) {
			printf("\nFibonacci index: %d\n", -1);
		}
		if (n == 1) {
			printf("\nFibonacci index: %d\n", 1);
		}
		for (i = 0; i < (n - 1); i++) {
			temp = right;
			right = left + temp;
			left = temp;
		}
		printf("\nFibonacci index: %d\n", left);

	return 0;
}

[redhead]

You need to flush stdout ie:

...
  printf("Enter New Index: ");
  fflush(stdout);
...