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

#define SET 20
#define LENGTH 13

void Init(double (*w)[LENGTH]);
void Input_file(double (*w)[LENGTH]);
void Write_file(double (*w)[LENGTH]);
void Print(double (*w)[LENGTH]);

FILE *fp;

int main()
{
    double Weight[SET][LENGTH];
    double Weight1[SET][LENGTH];

    Init(Weight);
    printf("orginal info as follow...\n");
    Print(Weight);
   
    Write_file(Weight);
    Input_file(Weight1);
    printf("Renew show in file !\n");
    Print(Weight1);


    return 0;
}

void Input_file(double (*w)[LENGTH])
{
    int i,j;

    if( (fp=fopen("king.txt","r"))==NULL )
    {
        printf("cannot open file !\n");
        return ;
    }

    for(i=0;i<SET;i++)
    {
        for(j=0;j<LENGTH;j++)
        {
            fscanf(fp,"%f",&(w[i][j]));
        }
    }
    fclose(fp);
}

void Write_file(double (*w)[LENGTH])
{
    int i,j;

    if( (fp=fopen("king.txt","w"))==NULL )
    {
        printf("cannot open file !\n");
        return ;
    }
   
    for(i=0;i<SET;i++)
    {
        for(j=0;j<LENGTH;j++)
        {
            fprintf(fp,"%6.2f ",w[i][j]);
        }
//        fprintf(fp,"\n");
    }
    fclose(fp);
}

void Init(double (*w)[LENGTH])
{
    int i,j;

    for(i=0;i<SET;i++)
    {
        for(j=0;j<LENGTH;j++)
        {
            w[i][j]=2.0;
        }
    }
}

void  Print(double (*w)[LENGTH])
{
    int i,j;

    for(i=0;i<SET;i++)
    {
        for(j=0;j<LENGTH;j++)
        {
            printf("%8.2f",w[i][j]);
        }
        printf("\n");
    }
    printf("\n");
}

求各位专家 帮忙 看看 好人有好报

Input_file(Weight1);有问题

函数有问题，正在找，我也是个菜鸟……

Input_file(Weight1);把这句话注释掉，发现和没注释没有区别，应该是这里有问题了。本人也是菜鸟啊，不过我会陪你搞定这个问题的。

Input_file()里的这句话没有作用
fscanf(fp,"%f",&(w[i][j]));
惭愧，本人C语言还未熟练就去学C++，
只能帮你到这里了，用C++比C简单多了。

void Input_file(double (*w)[LENGTH])
{
    int i,j;

    if( (fp=fopen("king.txt","r"))==NULL )
    {
        printf("cannot open file !\n");
        return ;
    }

    for(i=0;i<SET;i++)
    {
        for(j=0;j<LENGTH;j++)
        {
            fscanf(fp,"%lf",&(w[i][j]));
        }
    }
    fclose(fp);
}
惭愧，新手级别的问题。找到还真不容易，学习了……