I am having a problem with something. i nead to assing values to parameters from input.dat file without using fscanf.
i need to use the terminal like a.out<input.dat>output.out
i have a file like this
GEN
0.0 2.1351 0.00001 500 o
PEND
0.12 0.1 0.15 0.5 0
0.16 0.11 0.8 -0.5 0
0.78 0.24 0.11 -0.5 0
SP
0.2 0.1
it is a mixture of strings and doubles, and each value here belongs to a different variable, how can i assing it from the file.
i know its basic but i need help
To assign values to parameters from an `input.dat` file without using `fscanf`, you can use the command line input redirection feature in the terminal. Here's how you can do it:
1. First, open your terminal and navigate to the directory containing your `a.out` executable and `input.dat` file.
2. Compile your code by executing the appropriate compiler command. For example, if you are using `gcc`, you can compile your code using the command:
```
gcc your_code.c -o a.out
```
3. Once your code is compiled, use the following command to run your program and redirect the contents of `input.dat` as input to your program:
```
./a.out < input.dat > output.out
```
4. Inside your code, you can read the input values from the standard input stream (`stdin`) just as you would read from a file. You can use functions like `scanf` or `fgets` to read the values.
For example, if you have three variables `x`, `y`, and `z`, and you want to read three double values from the input file:
```c
double x, y, z;
scanf("%lf %lf %lf", &x, &y, &z);
```
Since the input file `input.dat` is redirected as the standard input stream, the above `scanf` statement will read the corresponding double values from the file.
5. After reading the values, you can perform any required operations using the assigned values.
6. Finally, you can write the output of your program to the `output.out` file. For example, for printing the values of variables `x`, `y`, and `z`:
```c
printf("x: %lf\ny: %lf\nz: %lf\n", x, y, z);
```
Since the standard output stream is redirected to the `output.out` file, the `printf` statement will write its output to the file.
By following these steps, you can read the values from the `input.dat` file and assign them to the appropriate variables in your program without using `fscanf`.