Problem using strcmp

[Pramod]

Hi,

I'm new to programming in c++ and I've encountered a problem while trying to use the strcmp function. I use Dev c++ version 4.9.9.2. The program is a very simple one, trying to copy lines from one file to another till the occurence of a specific sentence. When trying to compile, it doesnt seem to like the strcmp function even though I've included

include <string>. The program and compile log are shown below

include <iostream>

include <string>

include <fstream>

include <stdlib.h>

using namespace std;
int main()
{

string s="this sentence",t;

ifstream fin;
ofstream fout;

fin.open("job-1.dat");
if(fin.fail())cout<<"opening failed";
else cout<<"opening successful";
fout.open("copy.txt");

do
{
 getline(fin,t);
  fout<<t<<endl;

}while(strcmp(t,s)!=0);

fin.close();
fout.close();
system("pause");

}

The compile log is as follows:

Compiler: Default compiler
Executing g++.exe...
g++.exe "C:\Dev-Cpp\trials\Untitled3.cpp" -o "C:\Dev-Cpp\trials\Untitled3.exe" -I"C:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include" -I"C:\Dev-Cpp\include\c++\3.4.2\backward" -I"C:\Dev-Cpp\include\c++\3.4.2\mingw32" -I"C:\Dev-Cpp\include\c++\3.4.2" -I"C:\Dev-Cpp\include" -L"C:\Dev-Cpp\lib"
C:\Dev-Cpp\trials\Untitled3.cpp: In function int main()': C:\Dev-Cpp\trials\Untitled3.cpp:26: error: no matching function for call tostrcmp(std::string&, std::string&)'
C:/Dev-Cpp/include/string.h:43: note: candidates are: int strcmp(const char, const char)

Execution terminated

Any idea what I'm doing wrong ? This could be a total amateur mistake. Thanks a ton in advance.

Cheers
Pramod

[Somelauw]

strcmp() is for comparing char arrays. For cstring's you could just use the == operator like on integers, floats, etc.

[BiT]

C:\Dev-Cpp\trials\Untitled3.cpp:26: error: no matching function for call to `strcmp(std::string&, std::string&)'

C:/Dev-Cpp/include/string.h:43: note: candidates are: int strcmp(const char, const char)

two lines above are what you need to look at.
They point out that first "no matching function for call to `strcmp(std::string&, std::string&)"
and that the valid "candidates are: int strcmp(const char, const char)"

Use the function "c_str()" to convert your strings to character arrays.

strcmp(t.c_str(),s.c_str())