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true (C++)

bool-identifier = true ; 
bool-expression logical-operator true ;

This keyword is one of the two values for a variable of type bool or a conditional expression (a conditional expression is now a true boolean expression). If i is of type bool, then the statement i = true; assigns true to i.

// bool_true.cpp
#include <stdio.h>
int main()
    bool bb = true;
    printf_s("%d\n", bb);
    bb = false;
    printf_s("%d\n", bb);