Write a program which asks user to enter a filename and then reads
numbers from that file until end of file is reached.
When the end of file is reached program prints the sum of numbers
and the amount of numbers that was read from the file.

codeblocks调试没问题，一运行程序就直接死掉。。
请问哪里错了。。


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

#define MY_FILENAME "numbers.txt"
#define LINESIZE 80
int main()
{
    FILE *fp;
    char *filename="numbers.txt",*fileinput,*fileptr;
    int count=0;
    int value=0;
    double sum=0;
    char line[LINESIZE];
    printf("Please enter a filename!\n");
    scanf("%s",fileinput);
    fileptr=strstr(filename,fileinput);
    if (fileptr)
    {
        fp=fopen("numbers.txt","r");
        if (fp==NULL)
        {
            printf("Unable to open %s\n", MY_FILENAME);
        }
        else
            printf("numbers from %s...\n",MY_FILENAME);
        while (!feof(fp))
        {
            if (fgets(line,LINESIZE,fp)!=NULL)
            {
                if (sscanf(line,"%d",&value)==1)
                {
                    sum+=value;
                    count++;
                    printf("Read %d\n",value);
                }
                else
                {
                    printf("Invalid line\n");
                }
            }
        }
        fclose(fp);
        printf("the sum of %d numbers from %s is %f\n",count,MY_FILENAME,sum);
    }
    else
        printf("the file doesn't exist");
    return 0;
}

好像是scanf不能给指针赋值？ 那看输入的字符串和 已经储存的字符串是否匹配应该怎么写啊，strstr好像只能用指针哦。

能不能举个例子啊，谢谢

题目就是要输入个文件名，打开文件，将所有数字相加求和并显示出一共有多少个数字

我的问题是文件名的匹配怎么写
如果是strstr的话只能用指针
而scanf又不能直接对指针赋值
应该怎么做，谢谢

老师给的题目是英文的。。