兔子五元一只，鸡三元一只，小鸭子一元三只，现在你有一百元要买一百只，兔子、鸡、鸭子，问兔子、 鸡、鸭子各买多少只，每种必须至少一只，下列哪个程序能实现。（ ）。
- A. 1 for(int i = 0; i <= 100; i++){ 2 for(int j = 0; j <= 100; j++){ 3 for(int k = 0; k <= 100; k++){ 4 if(i + j + k == 100 && 25 * i + 10 * j + k == 300) 5 cout << i << " " << j << " " << k << endl; 6 } 7 } 8 }
- B. 1 for(int i = 0; i <= 100; i++){ 2 for(int j = 0; j <= 100; j++){ 3 for(int k = 0; k <= 100; k++){ 4 if(i + j + k == 100 && 20 * i + 10 * j + k == 300) 5 cout << i << " " << j << " " << k << endl; 6 } 7 } 8 }
- C. 1 for(int i = 0; i <= 20; i++){ 2 for(int j = 0; j <= 34; j++){ 3 for(int k = 0; k <= 20; k++){ 4 if(i + j + k == 100 && 15 * i + 9 * j + k == 300) 5 cout << i << " " << j << " " << k << endl; 6 } 7 } 8 }
- D. 1 for(int i = 0; i <= 100; i++){ 2 for(int j = 0; j <= 100; j++){ 3 for(int k = 0; k <= 100; k++){ 4 if(i + j + k == 100 && 15 * i + 9 * j + k == 300) 5 cout << i << " " << j << " " << k << endl; 6 } 7 } 8 }
正确答案：D