CODEWITHSUNDEEP
cfilelinear-equation
Islams
Islams

Reputation: 67

Read coefficients of linear equations from file into 2d array

I'm working on a program that reads linear equations from a file such as those - and solve them using matrices:

3x+2y-2z=9
-2x+9y+12z=23
4x-7y+9z=45

The file is supposed to contain n equations with n variables. How to get only the numbers and the signs from the above equations to store in 2d dynamic array of integers?

So output will be something like this:

 3  2 -2  9
-2  9 12 23
 4 -7  9 45

Upvotes: -1

Views: 687

Answers (1)

fluter
fluter

Reputation: 13796

Using fscanf, the 'd' modifier handles signed integer, that means it will take care of the input number whether it has + or - in front of it, try following code:

#include <stdio.h>

int main(void) {
    int x, y, z, e;
    FILE *fp = fopen("eq.txt", "r");
    if (!fp)
        return 1;
    while (fscanf(fp, "%dx%dy%dz=%d", &x, &y, &z, &e) == 4) {
        printf("%d %d %d %d\n", x, y, z, e);
    }
    return 0;
}

It outputs for the file you posted:

3 2 -2 9
-2 9 12 23
4 -7 9 45

Upvotes: 1

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