#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);
}

fscanf 写错了.

 fcanf(fp,"%2d,%6.2f",&i,&f);   这个是什么输入吗????有规定输入
精度

#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,%6f",i,f);
    fclose(fp);

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

    }
    i=0;f=0;
    fscanf(fp,"%2d,%6f",&i,&f);
    fclose(fp);

    printf("i=%2d,f=%.2f\n",i,f);
}

#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=%.2\n",i,f);
}


[ 本帖最后由 qq1023569223 于 2011-1-15 13:10 编辑 ]

4#正解

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