#include <stdio.h>
#include <stdlib.h>
void main()
{
    int i=3;
    float f=6.2;
   
    FILE *fp;

    if((fp=fopen("wang.txt","w"))==NULL)
    {
        printf("can't create file: wang.txt\n");
        exit(0);
    }
    fprintf(fp,"%2d,%6.2f",i,f);
    fclose(fp);

    if((fp=fopen("wang.txt","r"))==NULL)
    {
        printf("can't openfile:wang.txt\n");
        exit(0);

    }
    i=0;f=0;
    fcanf(fp,"%2d,%6.2f",&i,&f);
    fclose(fp);

    printf("i=%2d,f=%6f\n",i,f);
}