error C2106: '=' : left operand must be l-value

[VictorN]

	int sumrow0, sumrow1, sumrow2, sumrow3, sumrow4; /* declares sumrow0, sumrow1, sumrow2, sumrow3, sumrow4 to be a int variable */
	sumrow0 = val[0][0] + val[0][1] = val[0][2] + val[0][3] + val[0][4];

And what are you going to achieve with this strange assignment?