C++读取鸢尾花数据集

读取鸢尾花数据集可以使用以下代码：

#include <stdio.h>
#include <stdlib.h>

#define MAX_LINE_LENGTH 1024

int main() {
    FILE *fp;
    char line[MAX_LINE_LENGTH];
    float sepal_length, sepal_width, petal_length, petal_width;
    int label;

    fp = fopen("iris.data", "r");

    if (fp == NULL) {
        fprintf(stderr, "Error opening file.\n");
        exit(1);
    }

    while (fgets(line, MAX_LINE_LENGTH, fp) != NULL) {
        sscanf(line, "%f,%f,%f,%f,%d", &sepal_length, &sepal_width, &petal_length, &petal_width, &label);
        printf("%.1f, %.1f, %.1f, %.1f, %d\n", sepal_length, sepal_width, petal_length, petal_width, label);
    }

    fclose(fp);

    return 0;
}

注意，此代码假设数据集文件名为 `iris.data`，每行包含四个用逗号分隔的浮点数和一个整数标签。可以根据实际情况修改代码。