如何用c编程语言从(x1，y1) (x2，y2)形式的文件中提取一些x和y坐标呢？

#include <stdio.h>

#define MAX_COORDINATES 100

typedef struct {
    int x;
    int y;
} Coordinate;

int main() {
    FILE *file;
    char line[100];
    Coordinate coordinates[MAX_COORDINATES];
    int numCoordinates = 0;

    // 打开文件
    file = fopen("coordinates.txt", "r");
    if (file == NULL) {
        printf("无法打开文件。\n");
        return 1;
    }

    // 读取文件并提取坐标
    while (fgets(line, sizeof(line), file)) {
        int x, y;
        if (sscanf(line, "(%d, %d)", &x, &y) == 2) {
            coordinates[numCoordinates].x = x;
            coordinates[numCoordinates].y = y;
            numCoordinates++;
        }
    }

    // 输出提取的坐标
    for (int i = 0; i < numCoordinates; i++) {
        printf("坐标%d：x = %d, y = %d\n", i+1, coordinates[i].x, coordinates[i].y);
    }

    // 关闭文件
    fclose(file);

    return 0;
}