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Link: http://codepad.org/BuRU7eXl    [ raw code | output | fork ]

C, pasted on Nov 28:
#include<stdio.h>
#include<conio.h>
#include<math.h>
#define MAX 100
void NhapMaTran(int a[][MAX], int &n)
{
	do
	{
		printf("\nNhap n: ");
		scanf("%d", &n);
		if(n < 1 || n > MAX)
		{
			printf("\nSo phan tu khong hop le. Xin kiem tra lai !");
		}
	}while(n < 1 || n > MAX);

	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			printf("\nNhap vao a[%d][%d] = ", i, j);
			scanf("%d", &a[i][j]);
		}
	}
}

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


void HoanVi(int &a, int &b)
{
	int temp = a;
	a = b;
	b = temp;
}

void HoanVi2Cot(int a[][MAX], int n, int cot1, int cot2)
{
	if((cot1 >= 0 && cot1 < n) && (cot2 >= 0 && cot2 < n))
	{
		for(int i = 0; i < n; i++)
		{
			HoanVi(a[i][cot1], a[i][cot2]);
		}
	}
}

int main()
{
	int a[MAX][MAX], n, cot1, cot2;
	NhapMaTran(a,n);
	XuatMaTran(a,n);
	do
	{
		printf("\nNhap cot 1: ");
		scanf("%d", &cot1);

		if(cot1 < 0 || cot1 >= n)
		{
			printf("\nCot khong hop le. Xin Nhap lai!");
		}
	}while(cot1 < 0 || cot1 >= n);

	do
	{
		printf("\nNhap cot 2: ");
		scanf("%d", &cot2);

		if(cot2 < 0 || cot2 >= n)
		{
			printf("\nCot khong hop le. Xin Nhap lai!");
		}
	}while(cot2 < 0 || cot2 >= n);

	HoanVi2Cot(a, n, cot1, cot2);

	printf("\nMa tran sau khi hoan vi cot %d va cot %d \n", cot1, cot2);
	XuatMaTran(a, n);

	getch();
	return 0;
}


Output:
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9
Line 17: error: conio.h: No such file or directory
Line 5: error: expected ';', ',' or ')' before '&' token
In function 'XuatMaTran':
Line 29: error: 'for' loop initial declaration used outside C99 mode
Line 31: error: 'for' loop initial declaration used outside C99 mode
t.c: At top level:
Line 40: error: expected ';', ',' or ')' before '&' token
In function 'HoanVi2Cot':
Line 51: error: 'for' loop initial declaration used outside C99 mode


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