'What does this C value mean?

I am working on a university assignment where I have to do different calculations based on the value of a Signal. If C has the value 00 ,I have to return the sum of a and b and also OVF must be 1 if overflow happened.

The code was really basic :

temp <= ('0'&a)+('0'&b);

Result <= temp(3 downto 0);

OVF <= temp(4);

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Yet ,I somehow did something wrong .My issue is that vivado keeps showing me a value called C instead of the actual value of the vector. What does C mean? It's not included in any of the slides of the class.

vhdlvivado


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