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smallint  -32768~32767  0~65535
mediumint -8388608~8388607  0~16777215
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bigint  -9223372036854775808~9223372036854775807   0~18446744073709551615
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int change(int x,int y)
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int change(int *p,int *q)
{
int temp=*p;
*p=*q;
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}
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int change(int &x,int &y)
{
int temp=x;
x=y;
y=temp;
}
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