我无法让我的代码编译,因为它一直告诉我"错误:没有匹配的函数用于调用"在第16行。任何建议?我想读取文件并将所有元音写入输出文件。
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(){
string filename; // to hold the file name
ifstream inputfile; // input to a file
// Get the file name
cout << "Enter a file name: ";
cin >> filename;
// Open the file
inputfile.open(filename); // LINE 16
char vowel; // to store the vowels
ofstream outputfile; // to write to the file
// open file
outputfile.open("vowels_.txt");
while(inputfile.get(vowel)){
//If the char is a vowel or newline, write to output file.
if((vowel == 'a')||(vowel == 'A')||(vowel =='e')||(vowel =='E')||(vowel =='i')||(vowel =='I')||(vowel =='o')||(vowel =='O')||(vowel =='u')||(vowel =='U')||(vowel =='\n') && !inputfile.eof())
outputfile.put(vowel);
}
inputfile.close();
outputfile.close();
}
答案 0 :(得分:2)
改变这个:
inputfile.open(filename);
到此:
inputfile.open(filename.c_str());
因为filename
是std::string
,fstream::open
需要const char* filename
作为参数。
致电string:c_str
从const char*
返回std::string
。
C ++ 11不需要这个,因为fstream::open
被重载以获取std::string
。使用-std=c++11
标志进行编译以启用c ++ 11。
PS:Why don't the std::fstream classes take a std::string?(Pre-C ++ 1)