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List of rivers by continent is given. Find average length of rivers on chosen continent. C++

In this line

if (river[i].continent == u)

you are comparing two char* pointers (wich will never have the same value for sure).
You probably want to do

if (strncmp(river[i].continent,u,sizeof(u)) == 0)

to check if the character arrays pointed have the same content.

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