Thread: writing an int field to a file

fwrite() or some other write method, using a binary mode of access.

I had the same problem. Here is how I solved it this works for 2 variables wich is harder than one.

1. Create a file on your C drive called "file.txt" with the following text:

Code:

var1 = 1; var2 = 2;

2.Then add the following code to read those two variables, add 3 to each, and then write it to file again.

Code:

 
#include<stdio.h>
main()
{
 int var1;
 int var2; 
 FILE *fp;
 FILE *fw;
 char *char1;
 char *char2;
 char1="var1 = ";
 char2="var2 = ";
 
 fp=fopen("c:\\file.txt", "r");
 
 fscanf(fp, "var1 = %d; var2 = %d;", &var1, &var2);
 printf("%d\n", var1+3);
 printf("%d\n", var2+3);
 var1= (var1 + 3);
 var2= (var2 + 3);
 
 fclose(fp);
 
 
 
 fw=fopen("c:\\file.txt", "w");
 
 fputs(char1, fw);
 fprintf(fw, "%d; ", var1);
 fputs(char2, fw);
 fprintf(fw, "%d;", var2);
 
 fclose(fw);
}

3.Compile this and then run it the program should dislplay:

4
5

and the next time you run it:

7
8

and so on and you can change the numbers and it will stay to the same pattern.

Note: You may have to adjust the location based on your set up. And if your running windows make shure the application isnt set to close on exit under properties.

C-Compiler

always remember: DOS wasnt written in a day...

This works I have used this method in other programs for things such has highscores.

C-Compiler, I think the original poster (OP) meant how to do it in binary.

Also, it's Amateur Programmer, not Amature Programer.

That is just how I figured to do that and it works fine for me, and Ill correct the spelling.