Reading from file to multi dimensional array

[shakunni]

So I have to read data from a text file into a [50][50] array and Im not really sure which commands I can use to do that and to write back some data into another file. Would really appreciate some help on this.

[Ancient Dragon]

fstreams. Also google for fstream tutorials. ifstream is for input files, ofstream for output files. With a little practice its not all that hard to do. Exactly how to do it will depend on file contents -- post a couple lines from the file.

[shakunni]

I tried using the fopen() function to open the file and then subsequently read from it. However, for some reason it doesnt seem to be accepting the filename parameter and it directly jumps to the else portion of the code. Any ideas why?

else if(choice==1)
		{
			printf("\n Enter file name:");			
			scanf("%s",&filename);
			printf("File name entered: %s",&filename);
			p = fopen(&filename,"rt");
			if(p!= NULL)
			{
				int breakcounter=0; // to break the outer for loop when the inner loop breaks.
				for( i=0;i<50;i++)
				{
					for( j=0;j<50;j++)
					{
						if(!feof(p))
						{
							char c=fgetc(p);
							Matrix[i][j]=c;
						}
						
						else 
						{
							breakcounter=1;
							break;
						}
			
					}

					if(breakcounter==1) // to break the outer loop once the inner loop has broken
					{
						break;
					}
				}
			}

			else
			{
				printf("\nThe file name you entered is incorrect. You will now be returned to the main menu.");
			}
		}

[VernonDozier]

I've never heard of "rt" mode. Are you sure you didn't intend the mode to be "r+"? Check errno and see what the problem is. Here's the man page for fopen. I see no "rt" option on it. It also has the possible error flags.

http://www.manpagez.com/man/3/fopen/

But since you're using C++, I'd use the fstream library as Ancient Dragon suggested.

http://www.cplusplus.com/reference/iostream/fstream/