So this plus plus is sort of shorthand notation for incrementation. So just add 1 to this variable's value, so now socks on feet is of course 1 and so next.
那么这个++符号是递增排序的,所以仅仅是对这个变量加一,现在袜子在脚上是一,那么下一个也是这样。
Then you want to add the present value of the principal and that's the formula.
最后还要加上债券面值的现值,这就是债券定价公式
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