读取一个文件的数据经过某种操作，将结果存储到另外一个文件

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 
 4 int main()
 5 {
 6     FILE *fp_read, *fp_write;
 7     int i,j,k,l;
 8     float avg;
 9     fopen_s(&fp_read,"E:\\score.txt","r");
10     fopen_s(&fp_write,"E:\\average.txt","w");
11 
12     while(!feof(fp_read))
13     {
14         fscanf(fp_read,"%d %d %d %d",&i,&j,&k,&l);
15         avg = (float)(i + j + k + l) / 4;
16         fprintf(fp_write,"%3d %3d %3d %3d %.2f",i,j,k,l,avg);
17         fputc(‘\n‘,fp_write);
18     }
19 
20     fclose(fp_read);
21     fclose(fp_write);
22 
23     system("pause");
24     return 0;
25 }