calc 3+4
calc 3++4
calc 3*4+5
calc 3*4,5
calc 3+4*5
calc 3+4*5x
calc 1/2*3+4
calc 1/ 2*3+4
calc 143243243243242323*342343443234324
calc 143243243243242323a*342343443234324
calc x=700
calc x=
calc x+x
calc x.x
calc 10000/22222*333333+44444
calc yval10=10
calc yva*l=10
calc x=x+yval+z
calc x+=x+yval+z
calc x=x+yval+znyvalx+yval/yval
calc x=x+yval+znyvalx+yval/yval.
calc big=11111111111111111*11111111111111111+big+nbig
calc  big=11111111111111111*11111111111111111+big+nbig
calc ABC1xxxxxxxxxxxxxxxxxxxx=72345234524352345+nyval10+yval+z+dsfgsdfg+sdrgsdfg-sertmns-xxxxxxxxxxxxxxxxxxxx/34534
calc .ABC1xxxxxxxxxxxxxxxxxxxx=72345234524352345+nyval10+yval+z+dsfgsdfg+sdrgsdfg-sertmns-xxxxxxxxxxxxxxxxxxxx/34534
calc w1dth2=555
calc h3ight4=77
calc area0=w1dth2*h3ight4
calc area=area0*2
calc twicearea=twicearea*twicearea
calc twicearea
calc twicearea\
calc x=x+yval+z+
calc x==x+yval+z+
calc -x+=x+yval+z
calc .x=x++yval+znyvalx+yval/yval$
calc X=x++yval+znyvalx+yval/yval$
calc twicearea=twicearea*twicearea\ntwicearea'