c++ - What keyword "value" means? -

struct treenode {     int value;     treenode* left;     treenode* right; }; 

i'm studying code of binary tree data structure , stumbled upon never seen yet, can explain keyword value means? confused me, because members in struct green in ide.

it's not keyword, it's name of struct member of type int.

treenode node; node.value = 1; std::cout << node.value << std::endl;