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下边这段程序在tc3.0编译通不过，说是第四行undefined symbol 'bool'，不只是怎么回事

#include
#include
void main()
{ double x,i=10000000;
    int j=0;
unsigned int quotient,remainder;
bool beginFlag=0,zeroFlag=0;
cout<<"请输入预转换数额（小于1亿）：";
cin>>x;
    while (x>=100000000 )
{
if (j>=2)
{
cout<<"你的错误输入已达3次，你无权再输入！"<     return;
}
cout<<"你输入的金额超出转换范围，请重新输入！"<        cout<<"请输入预转换数额（小于1亿）：";
    cin>>x;

j++;
}

if (x<=0)
{
cout<<"零元整"< return;
}    x=floor(x*100 +0.5)/100; //小数点后2位四舍五入

while (i>0.001)
{
if (i>0.9)
quotient=(unsigned int)floor(x/i);
else
{
if (i>=0.099)
quotient=(unsigned int)floor(x*10);
else
quotient=(unsigned int)floor(x*100);
}
remainder=quotient%10;

if (remainder!=0)
beginFlag=1;

if ((zeroFlag==1) && (beginFlag==1) && (i>1000) && (remainder>0))
cout<<"零";

switch (remainder) //输出大写数字
{
case 0:
break;
case 1:
cout<<"壹";
break;
case 2:
cout<<"贰";
break;
case 3:
cout<<"叁";
break;
case 4:
cout<<"肆";
break;
case 5:
cout<<"伍";
break;
case 6:
cout<<"陆";
break;
case 7:
cout<<"柒";
break;
case 8:
cout<<"捌";
break;
case 9:
cout<<"玖";
break;
}

if (remainder>0)
zeroFlag=0;
else if (beginFlag==1)
zeroFlag=1;

if (beginFlag==1)        //输出单位
{
if ((i==10000000) && (remainder>0))
cout<<"仟";
if ((i==1000000) && (remainder>0))
cout<<"百";
if ((i==100000) && (remainder>0))
cout<<"十";
if (i==10000)
cout<<"万";
if ((i==1000) && (remainder>0))
cout<<"仟";
if ((i==100) && (remainder>0))
cout<<"百";
if ((i==10) && (remainder>0))
cout<<"十";
if (i==1)
cout<<"元";
if ((i>=0.09) && (i<1) && (remainder>0))
cout<<"角";
if ((i>=0.009) && (i<0.1) && (remainder>0))
cout<<"分";
}
i=i/10;
}
cout<<"整"<}


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