如何从文本文件中读数据并把数据转换成浮点型数据！

#include <string.h>
#include<stdio.h>
#include<stdlib.h>
main()
{
FILE *fp;
char command[80];
char *result=NULL;
float data[80];
char cc[]=",";
int i=0;
fp=fopen("data.txt","r");
if(!fp)
{
printf("can't open the file,exiting.../n");
exit(1);
}
while(fgets(command,80,fp)!=NULL)
{
// fread(command,4,10,fp);
// fgets(command,80,fp);
puts(command);
//printf("%d/n",strlen(command));
result=strtok(command,cc);
while( result != NULL ) {
data[0][i]=atof(result);
printf("%d,%f/n",i,data[0][i]);

result = strtok(NULL,cc );

i++;
}
}
fclose(fp);
printf("/n");
for(i=0;i<80;i++)
printf("%f/n",data[i]);
}