Subtraction and multiplication

typedef ttmath::Int<TTMATH_BITS(384)> Int;
int main()
{
Int t,o=0,z=0,x;
Int p;
//this segment is giving errors
p=z-o;
if(p<0)
p*=-1;
//segmen ends

//and in the below code p==1 is also giving errors
if(p==1&&z!=0&&o!=0)
cout<<"YES\n";
}

can u please help me with this?

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