Converting from C++ to C language

[Zulfi Khan2]

Hi,

I want to convert from following C++ statements to C- language:

 
ifstream inFile;
inFile >> num_rows;
file_buffer.resize(num_rows);

I have written the following code:

     
     FILE* inFile;
    inFile = fopen(argv[1], "r");
    fgets(strNum_rows, 20, inFile);
    num_rows = atoi(strNum_rows);

Is the above correct conversion?

However, I can't convert

file_buffer.resize(num_rows);

Some body please guide me how to convert the above code in C language.

file_buffer has following declarations:

     vector<double> file_buffer;

Some body please guide me.

Zulfi.

[VictorN]

Some body please guide me how to convert the above code in C language.

file_buffer has following declarations:

     vector<double> file_buffer;

Some body please guide me.

Zulfi.

instead of

     vector<double> file_buffer;

you should use the array of doubles.
To resize it - use malloc, realloc, free functions.

[2kaud]

Current version of the C standard allow the size of an array to be set at run-time instead of only at compile time (C++ only allows at compile time). So for C compilers that offer this option, you can do:

double file_buffer[num_rows];

If your C compiler doesn't allow this, then you'll need to use dynamic memory as suggested by Victor in his post #2.