C语言文件输入数组输出小代码

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

#define N 4   //4列
#define L 100  //100行

const char file_name[50] = "d:\\a.txt";

int main(int argc, char *argv[])
{
FILE *fp;
double data
[L] = {0.0};   //二维数组
int index
= {0};   //二维数组列下标
double temp;
int i, j;
int count = 0;  //计数器，记录已读出的浮点数
if((fp=fopen(file_name, "rb")) == NULL) {
printf("请确认文件(%s)是否存在!\n", file_name);
exit(1);
}
while(1==fscanf(fp, "%lf", &temp)) {
data[count%N][(index[count%N])++] = temp;
count++;
}
for(i = 0; i < N; i++) {
printf("第%d列元素为: \n", i+1);
for(j = 0; j < index[i]; j++) {
printf("%.16f ", data[i][j]);
}
printf("\n");
}
fclose(fp);
return 0;
}