>>Following code gives me an error when I use text field in CSV file instead of float or integer fields

what compiler? post the errors. The compiler should give you warnings that it is converting int to char and may lose data.

what does the csv file look like -- can you post the first two or three lines? Are the values between -127 and 126 because that is the range of signed char. If the csv file contains larger numbers then you will have to redeclare the matrix as a 2d array of ints, not chars

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int matrix_points[6][8];

int matrix_points[6][8];

and the while loop is incorrect. use of eof() is unpredictable.

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// while(!(input_file.eof()))
//{
while( input_file.getline(line, sizeof(line), ',') > 0)
{
   // blabla
}

// while(!(input_file.eof())) //{ while( input_file.getline(line, sizeof(line), ',') > 0) { // blabla }

>> printf("%s", matrix_points[i][0]);
all these lines are incorrect -- %s expects a null-terminated string, and what you are passing is just one character. They should look like this

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 printf("%s", matrix_points[i]);

printf("%s", matrix_points[i]);

This assumes that the array is null-terminated strings. If not, then %s will not work -- probably crash your program. In that case, change %s to %c as your original post

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 printf("%c", matrix_points[i][0]);

printf("%c", matrix_points[i][0]);

Finally, you can use loops to make the program more efficient. You can replace all those getline()s with just this one.

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int r = 0, c = 0;
while( input_file.getline(line, sizeof(line), ',') > 0)
{
   matrix_points[r][c] = (char)atoi(line);
   ++c;
   if( c == 8)
   {
        r++;
        c = 0;
   }
}

int r = 0, c = 0; while( input_file.getline(line, sizeof(line), ',') > 0) { matrix_points[r][c] = (char)atoi(line); ++c; if( c == 8) { r++; c = 0; } }

Hi Dragon,
This is how the csv file looks

ECU ID FuncID TstID TstStatus ResType ResCode codeTxt deftText
* * * * * * Default Default
ECU_MODEL_KWP_ECCS 4 WS-2-1 * * * 1 Emergency stop
ECU_MODEL_KWP_ABS 3 AT-2-01 * * * 2 Stop test
...
...
As of now I have 6 rows and 8 columns. In future rows may increase and column might also change. So how can we make it dynamic. But first I want my static one to work. Would appreciate your support in this regard.

Narender

Its a VC++ compiler and gives the following message

error C2440: '=' : cannot convert from 'char [255]' to 'char'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast