[問題] C++ 問題

看板C_and_CPP (C/C++)作者 (MPower)時間16年前 (2009/02/27 01:29), 編輯推噓6(6011)
留言17則, 4人參與, 最新討論串1/1
請各位高手幫我看一下為什麼跑不出來!!!謝 Write a function with the following prototype: bool compute(int one, int two, int & sum, int & product, double & quotient); sum will be one + two, product will be one * two, and quotient will be one/two provided that two is not 0. If the quotient can be computed,( i.e. two is not 0 ) return true. If the quotient cannot be computed ( i.e. two has a value of 0 ), return false. Write a driver program to test both cases. #include <iostream> using namespace std; bool compute(int one, int two, int& sum, int& product, double& quotient); int main() { int a,b,c,d,e; cout << "please enter two number: "; cin >> a >> b; compute(a,b,c,d,e); cout << "Results: " << c << ' ' << d << ' ' << e << endl; return 0; } bool compute(int one, int two, int& sum, int& product, double& quotient) { sum = one + two; product = one * two; quotient = one/two; } -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 71.199.79.106

02/27 01:50, , 1F
compute的return value
02/27 01:50, 1F

02/27 01:53, , 2F
什麼意思不太懂~~謝謝
02/27 01:53, 2F

02/27 02:13, , 3F
要檢查two不是0來決定回傳值啊 你沒return
02/27 02:13, 3F

02/27 09:56, , 4F
本來小弟也以為是compute沒return所以根本build不過.
02/27 09:56, 4F

02/27 09:56, , 5F
拿DevCpp build了一遍, 才發現是compute最後一個參數有
02/27 09:56, 5F

02/27 09:57, , 6F
問題; main裡最後一個參數傳了一個int進去, compute函數
02/27 09:57, 6F

02/27 09:57, , 7F
卻要收一個double參考, compute是這邊沒有過.
02/27 09:57, 7F

02/27 09:58, , 8F
pass by value時可能有隱式轉型所以這樣傳沒什麼問題.y
02/27 09:58, 8F

02/27 09:58, , 9F
pass by ref的時候這樣隱式轉型(應該變暫存const吧)不
02/27 09:58, 9F

02/27 09:58, , 10F
會過.
02/27 09:58, 10F

02/27 09:59, , 11F
最後, "不會過", 是跑出來結果錯, 還是compile不會過.
02/27 09:59, 11F

02/27 09:59, , 12F
建議寫清楚點, 有時候build error看一下就知道錯在哪了.
02/27 09:59, 12F

02/27 10:02, , 13F
修正一下, "不會過" -> "跑不出來".
02/27 10:02, 13F

02/27 11:29, , 14F
謝謝~已經可以跑了,謝謝指導
02/27 11:29, 14F

02/27 16:15, , 15F
C++98應該有規定除了main以外的function有return value
02/27 16:15, 15F

02/27 16:16, , 16F
都必須return
02/27 16:16, 16F

02/27 17:14, , 17F
果然還是reutrn, 把程式寫完整才對....Orz
02/27 17:14, 17F
文章代碼(AID): #19fj5Y22 (C_and_CPP)
文章代碼(AID): #19fj5Y22 (C_and_CPP)