在第5行output函数那里出现unknown type name 'y'

Question

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char data[10001][10001];
int output(int x,y)
{
	int i,j;
	for(i=0;i<=x;i++)
	{
		for(j=0;j<y;j++)
		{
			printf("%c",data[x][y]);
		}
	}
}
int main()
{
	
	FILE *fp = fopen("test.txt","w+");
	/*the FILE I/O starting		x=line		y=list*/
	int x=0,y=1;//x指向栈顶的下一个元素 
	char buff;
	for(;;)
	{
		buff = getch();
		/*meaning-changed char or normal-char*/
		if(buff == '\b' && (x>0||y>1))
		{
			/*backspace or backline*/
			if(y>0)
			{
				data[x][--y] = 0;
			} 
			else
			{
				x--;
				y = strlen(data[x]);
				output(x,y);
			}
		}
		else if(buff == '\r')
		{
			/*LINE-CHANGE*/
			x++;
			y=0;
			output(x,y);
		}
		else if(buff == 27)
		{
			/*save*/
			int i,j;
			for(i=0;i<=x;i++)
			{
				for(j=0;j<y;j++)
				{
					fprintf(fp,"%c",data[i][j]);
				}
			}
			fclose(fp);
			break;
		}
		else
		{
			data[x][y] = buff;
			y++;
			output(x,y);
		}
		
	}
	
	system("pause");
	return 0;
}

Answer 1

y没有声明类型，应该是int output(int x,int y)