The content of the file "person.txt" is
Sarah
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Question
C++ File
#include<iostream>
#include<fstream>
using namespace std;
class person
{
protected:
char name[40];
int age;
public:
void showdata(void)
{
cout<<"\n Name:"<<name;
cout<<"\n Age:"<<age;
}
};
void main(void)
{
person pers;
ifstream infile("person.txt");
infile.read((char *) &pers,sizeof(pers));
pers.showdata();
}
I compiled and run the above program. But junk values are displayed along with name and age. Why?
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Answers
Hi,
As you are reading from a text file, you cannot directly map the structure values to the data stored in your file. The Data has to be in the binary format which is in sync with your class members. i.e. your first name should always be of size 40 in your binary file followed by a 4 byte integer.
Dennis
If it is a must to read from text file and the content of the text file is as you have mentioned (name followed by newline followed by age), then write the main function as follows: -
void main()
{
person pers;
FILE * fp = fopen("c:\\person.txt", "r");
if(fp)
{
fscanf(fp, "%[^\n]", pers.name);
fscanf(fp, "%d", &(pers.age));
pers.showdata();
fclose(fp);
fp = NULL:
}
}
Note: In order for the above code to compile, you must make name and age as public. If, for some reason, you do not want to make them as public, then read name and age from the file into local variables, add some function to person class which takes name and age as arguments and from main function, call that function passing the local variables.
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by: avinash_sahayPosted on 2004-03-07 at 19:36:57ID: 10537966
You are reading from a text file. Can you tell me the content of the file?