将线性方程的系数从文件读入 c 中的二维数组

Question

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 (some thing like this):

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

Thanks in Advanced

Answer 1

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