linux读取文件要用到stdio.h文件，在/usr/include下包含大部分的C头文件，sys/types.h也位于其中，/usr/src/linu-版本号 存放有你的内核源代码。
在linux下读文件也是fopen("文件名","方式"),方式有r,w等，下面为一段读文件的代码(cat 7_3.c)
1
#include
<
sys
/
types.h
>
2 #include < stdio.h >
3
4 int main( void )
5 {
6 float value,total[ 10 ];
7 int count,label;
8 FILE * fp;
9
10 for (count = 0 ;count < 10 ;count ++ )
11 total[count] = 0 ;
12
13 if ( ! (fp = fopen( " test.dat " , " r " )))
14 {
15 printf( " Error in open file!\n " );
16 exit( 1 );
17 }
18
19 while (fscanf(fp, " %d %f " , & label, & value))
20 {
21 total[label] += value;
22 if (feof(fp))
23 {
24 break ;
25 }
26 }
27
28 for (count = 0 ;count < 10 ;count ++ )
29 {
30 printf( " %d: %f\n " ,count,total[count]);
31 }
32 return 0 ;
33 }
2 #include < stdio.h >
3
4 int main( void )
5 {
6 float value,total[ 10 ];
7 int count,label;
8 FILE * fp;
9
10 for (count = 0 ;count < 10 ;count ++ )
11 total[count] = 0 ;
12
13 if ( ! (fp = fopen( " test.dat " , " r " )))
14 {
15 printf( " Error in open file!\n " );
16 exit( 1 );
17 }
18
19 while (fscanf(fp, " %d %f " , & label, & value))
20 {
21 total[label] += value;
22 if (feof(fp))
23 {
24 break ;
25 }
26 }
27
28 for (count = 0 ;count < 10 ;count ++ )
29 {
30 printf( " %d: %f\n " ,count,total[count]);
31 }
32 return 0 ;
33 }
编译
$ gcc -Wall -o 7_3 7_3.c
test.dat文件为
$ cat test.dat
结果为：
