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Link: http://codepad.org/jN7PeR0Z    [ raw code | output | fork ]

C, pasted on Apr 26:
#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<Windows.h>
int main()
{
	int Gia, TienTra, TienThoi;
	do
	{
		printf("\nNhap vao gia tien (Gia > 1000): ");
		scanf_s("%d", &Gia);
		Gia = (int)round((float)Gia);
		if (Gia <= 1000)
		{
			printf("\nGia tri ban nhap vao khong hop le. Xin vui long nhap lai! ");
		}

	} while (Gia <= 1000);

	do
	{
		printf("\nNhap vao tien khach hang tra (tien > 1000): ");
		scanf_s("%d", &TienTra);
		TienTra = (int)round((float)TienTra);
		if (TienTra <= 1000)
		{
			printf("\nGia tri ban nhap vao khong hop le. Xin vui long nhap lai! ");
		}

	} while (TienTra <= 1000);
	printf("\nDu lieu da hop le !");
	printf("\nBan co muon tiep tuc chuong trinh hay khong ? Neu co thi nhan phim C, nguoc lai nhan phim bat ky de thoat ra !");

	char t = _getch();
	if (t == 'c' || t == 'C')
	{
		system("cls");
	}

	TienThoi = TienTra - Gia;
	if (TienTra > Gia)
	{
		printf("\nTien thoi =  %d", TienThoi);
		printf("\nNguoi ban hang phai thoi lai tien nhu sau: ");

		int NamTramNgan = TienThoi / 500000;
		if (NamTramNgan > 0)
		{
			TienThoi = TienThoi % 500000;
			printf("\nSo to 500k la %d", NamTramNgan);
		}
		int HaiTramNgan = TienThoi / 200000;
		if (HaiTramNgan > 0)
		{
			TienThoi = TienThoi % 200000;
			printf("\nSo to 200k la %d", HaiTramNgan);
		}
		int MotTramNgan = TienThoi / 100000;
		if (MotTramNgan > 0)
		{
			TienThoi = TienThoi % 100000;
			printf("\nSo to 100k la %d", MotTramNgan);
		}
		int NamMuoiNgan = TienThoi / 50000;
		if (NamMuoiNgan > 0)
		{
			TienThoi = TienThoi % 50000;
			printf("\nSo to 50k la %d", NamMuoiNgan);
		}
		int HaiMuoiNgan = TienThoi / 20000;
		if (HaiMuoiNgan > 0)
		{
			TienThoi = TienThoi % 20000;
			printf("\nSo to 20k la %d", HaiMuoiNgan);
		}
		int MuoiNgan = TienThoi / 10000;
		if (MuoiNgan > 0)
		{
			TienThoi = TienThoi % 10000;
			printf("\nSo to 10k la %d", MuoiNgan);
		}
		int NamNgan = TienThoi / 5000;
		if (NamNgan > 0)
		{
			TienThoi = TienThoi % 5000;
			printf("\nSo to 5k la %d", NamNgan);
		}
		int HaiNgan = TienThoi / 2000;
		if (HaiNgan > 0)
		{
			TienThoi = TienThoi % 2000;
			printf("\nSo to 2k la %d", HaiNgan);
		}
		int MotNgan = TienThoi / 1000;
		if (MotNgan > 0)
		{
			TienThoi = TienThoi % 1000;
			printf("\nSo to 1k la %d", MotNgan);
		}
		if (TienTra < Gia)
		{
			printf("\nKhong du tien thoi! ");
		}
		else if (TienTra == Gia)
		{
			printf("\nKhong can phai thoi! ");
		}
	}



	_getch();
	return 0;
}


Output:
1
2
3
4
5
Line 17: error: conio.h: No such file or directory
Line 19: error: Windows.h: No such file or directory
In function 'main':
Line 12: warning: incompatible implicit declaration of built-in function 'round'
Line 24: warning: incompatible implicit declaration of built-in function 'round'


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