C从文件中加载矩阵

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3
 4 struct Matrix{
 5     int row;
 6     int col;
 7     int *mat;
 8 };
 9 /*初始化一个r行c列的矩阵*/
10 struct Matrix matrix_initialize( int r, int c )
11 {
12     struct Matrix m;
13     m.row = r;
14     m.col = c;
15     (m.mat) = (int *) malloc( sizeof(int)*(m.row)*(m.col));
16     return m;
17 }
18
19 /*打印矩阵到标准输出*/
20 void matrix_show( struct Matrix m )
21 {
22     int i,j;
23     for( i = 0; i<m.row; i++)
24     {
25         for(j = 0; j<m.col; j++)
26         {
27             printf("%d ",*(m.mat+i*(m.col)+j) );
28         }
29         printf("\n");
30     }
31 }
32
33 /*从文件加载矩阵，文件第一行为矩阵的行值和列值，以后为数据（int型）*/
34 struct Matrix* load( char *file_name, struct Matrix * pm )
35 {
36     FILE *fp;
37     if( !(fp = fopen( file_name, "r" ) ) )
38         exit(-1);
39     //struct Matrix *pm;
40     printf("loading file %s...\n",file_name);
41     fscanf(fp,"%d%d",&(pm->row),&(pm->col));
42     pm->mat = (int *) malloc(sizeof(int)*(pm->row)*(pm->col));
43     int i,j;
44     for(i=0;i<pm->row;i++)
45     {
46         for(j = 0; j < pm->col; j++)
47         {
48             if( fscanf(fp,"%d",((pm->mat)+i*(pm->col)+j)) == EOF )
49                 exit(-1);
50         }
51     }
52     fclose(fp);
53     return pm;
54 }
55
56
57 int main()
58 {
59     struct Matrix m;
60     struct Matrix *pm = &m;
61     pm = load("matrix.dat",pm);
62     matrix_show(*pm);
63     return 0;
64 }