C语言的关于文件读取的有关问题
C语言的关于文件读取的问题
原题是：输入一个正整数n，然后读取n个正整数，最后再读取一个正整数m，统计有多少整数小于m。代码如下，
int main()
{
FILE *fin,*fout;
fin = fopen("data.in","rb");
fout = fopen("data.out","wb");
int n,x,m,i,count = 0;
fscanf(fin,"d",&n);
printf("%d\n",n);
i = 1L;
while (feof (fin) == 0){
fseek(fin,i,0);
fscanf(fin,"d",&x);
if (x < m){
count++;
}
i++;
}
printf("%d\n",count);
fclose(fin);
fclose(fout);
return 0;
}
但是会陷入死循环，求大神解答
------解决方案--------------------
不知道是否符合，仅供参考：
------解决方案--------------------
仅供参考
原题是：输入一个正整数n，然后读取n个正整数，最后再读取一个正整数m，统计有多少整数小于m。代码如下，
int main()
{
FILE *fin,*fout;
fin = fopen("data.in","rb");
fout = fopen("data.out","wb");
int n,x,m,i,count = 0;
fscanf(fin,"d",&n);
printf("%d\n",n);
i = 1L;
while (feof (fin) == 0){
fseek(fin,i,0);
fscanf(fin,"d",&x);
if (x < m){
count++;
}
i++;
}
printf("%d\n",count);
fclose(fin);
fclose(fout);
return 0;
}
但是会陷入死循环，求大神解答
------解决方案--------------------
不知道是否符合，仅供参考：
#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *fin,*fout;
fin = fopen("data.in","rb");
if(fin == NULL)
{
printf("fin null\n");
exit(1);
}
fout = fopen("data.out","wb");
int n,m,x,count = 0;
fscanf(fin,"%d",&n);
printf("n = %d\n",n);
fseek(fin,-2,SEEK_END); //按你的题意，m是在文件最后，所以重新定位一下
fscanf(fin,"%d",&m);
printf("m = %d\n",m);
fseek(fin,2,SEEK_SET);//跳过已经输入的n
while(fscanf(fin,"%d",&x) == 1)
{
if (x < m)
{
count++;
}
}
printf("count = %d\n",count);
fclose(fin);
fclose(fout);
return 0;
}
------解决方案--------------------
仅供参考
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
int main()
{
FILE* fp_in;
FILE* fp_out;
int* start;
int* p;
int n;
int count=0;
fp_in = fopen("data.in","rb");
if(fp_in==NULL)
{
printf("FILES data.in can not open!\n");
exit(1);
}
fp_out = fopen("data.out","wb");
fscanf(fp_in,"%d",&n);
p=start=(int*)malloc(sizeof(int)*n);
for(;n>0;n--)
{
fscanf(fp_in,"%d",p);
p++;
}
fscanf(fp_in,"%d",&n);
for(p--;p>=start;p--)
{
if(*p<n)count++;
}
printf("%d\n",count);
fclose(fp_in);
fclose(fp_out);
return 0;
}