明确的说，就是我有一个句子，“I have apples.”,如下情况，怎么做？

Question

现在我需要输入到底有几个苹果，如果是只是显示，可以直接printf("I have %d apple.", x); 但是我希望在我输入苹果个数后把整句话放到一个string中，也就是 string y=“I have 6 apples.”;(假设我输入了6，变量y），请问如何做到？

Answer 1

如果只是想输入输出，那么很简单：int dd;cin >> dd;cout << "I have " << dd << " apples." << endl;如果想保存到string变量中，那么需要做一步整型转字符串操作，可以使用_itoa函数：int dd;string str = "I have ";char c[11];_itoa(dd, c, 10);str += c;str += " apples.";cout << str << endl;

Answer 2

如下代码：#include&nbsp;<sstream>#include&nbsp;<iostream>&nbsp;using&nbsp;namespace&nbsp;std;&nbsp;int&nbsp;main(){&nbsp;&nbsp;&nbsp;&nbsp;ostringstream&nbsp;ostr;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;x&nbsp;=&nbsp;1;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ostr&nbsp;<<&nbsp;"I&nbsp;have&nbsp;"&nbsp;<<&nbsp;x&nbsp;<<&nbsp;(x&nbsp;>&nbsp;1&nbsp;?&nbsp;"&nbsp;apples"&nbsp;:&nbsp;"&nbsp;apple")&nbsp;<<&nbsp;".";&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;string&nbsp;str&nbsp;=&nbsp;ostr.str();&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cout&nbsp;<<&nbsp;str&nbsp;<<&nbsp;endl;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;system("pause");&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;0;}