c - 将数据文件作为整数数组发送和接收到 C 中的函数

Question

我正在尝试将数组元素传递给从文件访问的函数。但是我不知道我的声明有什么问题，

这是代码，请帮帮我。

/*This program takes some random data from a file and 
  prepares a histogram for it.
*/

int getdata(int data[],FILE fptr1);

#include<stdio.h>

main()
{
    int i,hist[15]={0},elements[15],data[80];
    FILE * fptr1;

    printf("welcome buddy\n");
    getdata(data,fptr1);

    for(i=1;i<80;i++)
        fprintf(stdout,"%2d",data[i]);

}

int getdata(int data[],FILE fptr1)
{
    fptr1=fopen("sampledata.txt","r");

    if(fptr1==NULL)

        printf("the file is not opened properly\n");

    //for(i=0;i<=79;i++)

    //scanf(fptr1,"%d",&data[i]);

    while((scanf(fptr1,"%d",&data)!=EOF))
        ;

    fclose(fptr1);

    return data;
}

Answer 1

改变

int getdata(int data[],FILE fptr1);

到

void getdata(int (*data)[80],FILE* f(*data)[80]ptr1)
/* Case 1
 * You need a pointer to 80 member integer array
 * fptr1 is a pointer, a pointer should be passed as a pointer
 */

或

 void getdata(int data[80],FILE* f(*data)[80]ptr1)
/* Case 2
 * fptr1 is a pointer, a pointer should be passed as a pointer
 */

改变

(scanf(fptr1,"%d",&data)!=EOF)

到

(fscanf(fptr1,"%d",data[i])==1) //case1
// data is a pointer,so no ampersand preceeding it
// fscanf returns the number of values filled

或

(fscanf(fptr1,"%d",&data[i])==1) //case2

// fscanf returns the number of values filled

然后删除

return data;

建议

维护一个读取值的数量是很好的，你可以放

int count=0;

在函数的开头然后做

while((fscanf(fptr1,"%d",&data)==1))
        count++;

并替换

return data;

与

return count; // here function return type should be int.

在main函数中捕获count的值并打印直到count为止的元素。