存儲CSV文件到浮點數矩陣用C

Question

代碼不在行成矩陣的最後一個逗號後的值存儲...

full list.csv是這樣的：

123456,57,45,,67,,56,,63,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,,1523521 
123457,57,45,,67,,56,,634,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,1234,, 
123458,57,45,,67,,56,,63,,,724,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,1234, 
123459,57,45,,67,,56,,63,,,72,647,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,,1234 
123450,57,45,,67,,56,,63,,,72,67,,,,344,56,,,,,56,,,,,,,,,,,,,,45,,,,,124 
123451,57,45,,67,,56,,63,,,72,67,,,,34,564,,,,,56,,,,,,,,,,,,,,45,,,,, 
123452,57,45,,67,,56,,63,,,72,67,,,,34,56,,,,,564,,,,,,,,,,,,,,45,,,,,124 
123453,57,45,,67,,56,,63,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,454,,,,, 
123454,57,45,,67,,56,,63,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,,124 
123455,574,45,,67,,56,,63,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,, 
123465,57,454,,67,,56,,63,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,, 
123466,57,45,,674,,56,,63,,,72,67,,,,34,56,,,,,56,,,,,,,,,,,,,,45,,,,,124 

這是我的代碼：

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 

int main(void) 

    { 
    int lines_allocated = 1000; 
    int max_line_len = 150; 
    double c[42][1000]; 
    char **words = (char **)malloc(sizeof(char*)*lines_allocated); 
    if (words==NULL) 
     { 
     fprintf(stderr,"Out of memory (1).\n"); 
     exit(1); 
     } 

    FILE *fp = fopen("full list.csv", "r"); 
    if (fp == NULL) 
     { 
     fprintf(stderr,"Error opening file.\n"); 
     exit(2); 
     } 

    int i; 
    for (i=0;1;i++) 
     { 
     int j; 

     if (i >= lines_allocated) 
      { 
      int new_size; 

      new_size = lines_allocated*2; 
      words = (char **)realloc(words,sizeof(char*)*new_size); 
      if (words==NULL) 
       { 
       fprintf(stderr,"Out of memory.\n"); 
       exit(3); 
       } 
      lines_allocated = new_size; 
      } 
     words[i] = (char*)malloc(max_line_len); 
     if (words[i]==NULL) 
      { 
      fprintf(stderr,"Out of memory (3).\n"); 
      exit(4); 
      } 
     if (fgets(words[i],max_line_len-1,fp)==NULL) 
      break; 

     for (j=strlen(words[i])-1;j>=0 && (words[i][j]=='\n' || words[i][j]=='\r');j--) 

     words[i][j]='\0'; 
     } 

    int j; 
    int k=i; 
    for(j = 0; j < k; j++) 
    { 
     printf("%s\n", words[j]); 
     char *pptr = words[j]; 
     int l; 
     for (l = 0; l < 42; l++) 
     { 
      char *ptr = strchr(pptr, ','); 
      if (ptr) 
      { 
       *ptr = 0; 
       c[l][j] = atof(pptr); 
       pptr = ptr + 1; 
      } 
     }  
    } 

    int l; 
    for (j = 0; j < k; j++) 
    { 
     printf("\n"); 

     for (l = 0; l < 42; l++) 
     { 
      printf("%.2f\t", c[l][j]); 
     } 
    } 
    for (;i>=0;i--) 
    free(words[i]); 
    free(words); 
    return 0; 
    } 

Answer 1

我想你錯過了一個簡單的例子：應該是

#include <ctype.h> 
... 
     char *ptr = strchr(pptr, ','); 
     if (ptr) 
     { 
      *ptr = 0; 
      c[l][j] = atof(pptr); 
      pptr = ptr + 1; 
     } 
     else if (isdigit(*pptr)) { 
      c[l][j] = atof(pptr); 
     }