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Link: http://codepad.org/bvUB3oVU    [ raw code | output | fork ]

C, pasted on Oct 6:
#include<stdio.h>
#include<conio.h>
#include<math.h>
#define MAX 100

void nhap (int a[], int &n)
{
	do
	{
		printf("\nNhap so phan tu: ");
		scanf("%d", &n);
		if(n <= 0 || n > MAX)
		{
			printf("\nSo phan tu khong hop le. Xin kiem tra lai !");
		}
	}while(n <= 0 || n > MAX);
	for(int i = 0; i < n; i++)
	{
		printf("\nNhap a[%d]: ", i);
		scanf("%d", &a[i]);
	}
}

void xuat(int a[], int n)
{
	for(int i = 0; i < n; i++)
	{
		printf("%4d", a[i]);
	}
}

int KiemTraNguyenTo(int n)
{
	if (n < 2)
	{
		return 0;
	}
	else if (n > 2)
	{
		if (n % 2 == 0)
		{
			return 0;
		}
		for (int i = 3; i <= sqrt((float)n); i += 2)
		{
			if (n % i == 0)
			{
				return 0;
			}
		}
	}
	return 1;
}

float TinhTBCongNguyenTo(int a[], int n)
{
	int Tong = 0;
	float dem = 0;
	for(int i = 0; i < n; i++)
	{
		if(KiemTraNguyenTo(a[i]) == 1)
		{
			Tong += a[i];
			dem++;
		}
	}
	if(dem == 0)
	{
		printf("\nMang khong co so nguyen to");
		return 0;
	}
	return Tong/dem;
}
int main()
{
	int n;
	int a[MAX];

	nhap(a, n);
	xuat(a, n);
	float TBC = TinhTBCongNguyenTo(a, n);
	printf("\nTrung binh cong cac so nguyen to = %.3f", TBC);

	getch();
	return 0;
}


Output:
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8
Line 17: error: conio.h: No such file or directory
Line 6: error: expected ';', ',' or ')' before '&' token
In function 'xuat':
Line 26: error: 'for' loop initial declaration used outside C99 mode
In function 'KiemTraNguyenTo':
Line 44: error: 'for' loop initial declaration used outside C99 mode
In function 'TinhTBCongNguyenTo':
Line 59: error: 'for' loop initial declaration used outside C99 mode


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