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dekker.one
1% 变量
2var float: R; % 季度还款
3var float: P; % 初始借贷本金
4var 0.0 .. 10.0: I; % 利率
5
6% 中间变量
7var float: B1; % 一个季度后的欠款
8var float: B2; % 两个季度后的欠款
9var float: B3; % 三个季度后的欠款
10var float: B4; % 最后欠款
11
12constraint B1 = P * (1.0 + I) - R;
13constraint B2 = B1 * (1.0 + I) - R;
14constraint B3 = B2 * (1.0 + I) - R;
15constraint B4 = B3 * (1.0 + I) - R;
16
17solve satisfy;
18
19output [
20 "Borrowing ", show_float(0, 2, P), " at ", show(I*100.0),
21 "% interest, and repaying ", show_float(0, 2, R),
22 "\nper quarter for 1 year leaves ", show_float(0, 2, B4), " owing\n"
23];