Lỗi [Error] ld returned 1 exit status trong dev C

@Nguyen_Hai_An wrote:

Mng cho em hỏi en sai ở đâu vậy ạ ?

#include <stdio.h>

int CheckInteger(){
	
	int number; char c;
	int check = 0;
	
		
	do{
		fflush(stdin);
		printf("Please enter an integer: \n");
		
	}while(scanf("%d%c", &number, &c) != 2 || c != '\n');
		
	return;
}

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