c语言文件中存入/读取double型矩阵型数据

深藏阁楼爱情的钟 2022-01-06 04:29 395阅读 0赞

/*
     * test.c
     *
     *  Created on: Jun 1, 2019
     *      Author: lgh
     */
    
    #include <stdio.h>
    #include <stdlib.h>
    
    double** allocation_memory_double(int row, int cow)
    {
        int i = 0;
        double** p;
        p = (double**)malloc(row*sizeof(double*));
        for (i = 0; i<row; i++)
        {
            p[i] = (double*)malloc(cow*sizeof(double));
        }
        return p;
    }
    
    void* free_memory_double(double** p, int row)
    {
        if (NULL==p)
        {
            return NULL;
        }
        int i = 0;
        for (i = 0; i<row; i++)
        {
            free(p[i]);
        }
        free(p);
        return NULL;
    }
    
    int main(int argc, char* argv[])
    {
        double **M = allocation_memory_double(12,12);
        double **N = allocation_memory_double(12,12);
        int i,j;
        for(i=0;i<12;i++)
        {
            for(j=0;j<12;j++)
            {
                M[i][j] = i*12+j;
            }
        }
    
        FILE *file;
        if((file=fopen("/home/lgh/Desktop/aaa.txt","wb"))==NULL)
        {
            perror("无法打开该文件.\n");
            return -1;
        }
    
        for(i=0;i<12;i++)
        {
            for(j=0;j<12;j++)
            {
               fprintf(file, "%11f", M[i][j]);
            }
            fprintf(file,"\n");
        }
        fclose(file);
    
        double a[144]={
        0};
        FILE *fpRead=fopen("/home/lgh/Desktop/aaa.txt","r+");
        if(fpRead==NULL)
         {
                return -1;
         }
        for(i=0;i<144;i++)
        {
            fscanf(fpRead,"%lf ",&a[i]);
        }
        fclose(fpRead);
    
        for(i=0;i<12;i++)
        {
            for(j=0;j<12;j++)
            {
                N[i][j] = a[i*12+j];
                printf("N[%d][%d]=%10f  ",i,j, N[i][j]);
            }
            printf("\n");
        }
        free_memory_double(M,12);
        free_memory_double(N,12);
        return 0;
    }

写入后的文件数据：

![1329158-20190604220427451-925135149.png][]

打印信息：

N[0][0]=  0.000000  N[0][1]=  1.000000  N[0][2]=  2.000000  N[0][3]=  3.000000  N[0][4]=  4.000000  N[0][5]=  5.000000  N[0][6]=  6.000000  N[0][7]=  7.000000  N[0][8]=  8.000000  N[0][9]=  9.000000  N[0][10]= 10.000000  N[0][11]= 11.000000  
    N[1][0]= 12.000000  N[1][1]= 13.000000  N[1][2]= 14.000000  N[1][3]= 15.000000  N[1][4]= 16.000000  N[1][5]= 17.000000  N[1][6]= 18.000000  N[1][7]= 19.000000  N[1][8]= 20.000000  N[1][9]= 21.000000  N[1][10]= 22.000000  N[1][11]= 23.000000  
    N[2][0]= 24.000000  N[2][1]= 25.000000  N[2][2]= 26.000000  N[2][3]= 27.000000  N[2][4]= 28.000000  N[2][5]= 29.000000  N[2][6]= 30.000000  N[2][7]= 31.000000  N[2][8]= 32.000000  N[2][9]= 33.000000  N[2][10]= 34.000000  N[2][11]= 35.000000  
    N[3][0]= 36.000000  N[3][1]= 37.000000  N[3][2]= 38.000000  N[3][3]= 39.000000  N[3][4]= 40.000000  N[3][5]= 41.000000  N[3][6]= 42.000000  N[3][7]= 43.000000  N[3][8]= 44.000000  N[3][9]= 45.000000  N[3][10]= 46.000000  N[3][11]= 47.000000  
    N[4][0]= 48.000000  N[4][1]= 49.000000  N[4][2]= 50.000000  N[4][3]= 51.000000  N[4][4]= 52.000000  N[4][5]= 53.000000  N[4][6]= 54.000000  N[4][7]= 55.000000  N[4][8]= 56.000000  N[4][9]= 57.000000  N[4][10]= 58.000000  N[4][11]= 59.000000  
    N[5][0]= 60.000000  N[5][1]= 61.000000  N[5][2]= 62.000000  N[5][3]= 63.000000  N[5][4]= 64.000000  N[5][5]= 65.000000  N[5][6]= 66.000000  N[5][7]= 67.000000  N[5][8]= 68.000000  N[5][9]= 69.000000  N[5][10]= 70.000000  N[5][11]= 71.000000  
    N[6][0]= 72.000000  N[6][1]= 73.000000  N[6][2]= 74.000000  N[6][3]= 75.000000  N[6][4]= 76.000000  N[6][5]= 77.000000  N[6][6]= 78.000000  N[6][7]= 79.000000  N[6][8]= 80.000000  N[6][9]= 81.000000  N[6][10]= 82.000000  N[6][11]= 83.000000  
    N[7][0]= 84.000000  N[7][1]= 85.000000  N[7][2]= 86.000000  N[7][3]= 87.000000  N[7][4]= 88.000000  N[7][5]= 89.000000  N[7][6]= 90.000000  N[7][7]= 91.000000  N[7][8]= 92.000000  N[7][9]= 93.000000  N[7][10]= 94.000000  N[7][11]= 95.000000  
    N[8][0]= 96.000000  N[8][1]= 97.000000  N[8][2]= 98.000000  N[8][3]= 99.000000  N[8][4]=100.000000  N[8][5]=101.000000  N[8][6]=102.000000  N[8][7]=103.000000  N[8][8]=104.000000  N[8][9]=105.000000  N[8][10]=106.000000  N[8][11]=107.000000  
    N[9][0]=108.000000  N[9][1]=109.000000  N[9][2]=110.000000  N[9][3]=111.000000  N[9][4]=112.000000  N[9][5]=113.000000  N[9][6]=114.000000  N[9][7]=115.000000  N[9][8]=116.000000  N[9][9]=117.000000  N[9][10]=118.000000  N[9][11]=119.000000  
    N[10][0]=120.000000  N[10][1]=121.000000  N[10][2]=122.000000  N[10][3]=123.000000  N[10][4]=124.000000  N[10][5]=125.000000  N[10][6]=126.000000  N[10][7]=127.000000  N[10][8]=128.000000  N[10][9]=129.000000  N[10][10]=130.000000  N[10][11]=131.000000  
    N[11][0]=132.000000  N[11][1]=133.000000  N[11][2]=134.000000  N[11][3]=135.000000  N[11][4]=136.000000  N[11][5]=137.000000  N[11][6]=138.000000  N[11][7]=139.000000  N[11][8]=140.000000  N[11][9]=141.000000  N[11][10]=142.000000  N[11][11]=143.000000

转载于:https://www.cnblogs.com/GuanghuiLiu/p/10976547.html

[1329158-20190604220427451-925135149.png]: /images/20211228/186bf497260a4ab89b5cf0931514d7b2.png