how to store it

Code:

---

file:

>chromosome01
CTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAA
CCCTAAACCCTAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACAGCT
GACAGTACGATAGATCCACGCGAGAGGAACCGGAGAGACAACGGGATCCAGGCGCCAGCG
ACGGATCCGGGCGAGAGGGGAGTGGAGATCATGGATCCGTGCGGGAGGGGAAGAAGTCGC
CGAATCCGACCCTCCCATCGCCATCGACAGTAGGTCTGCGCGAGAGGGGCACCGGCGCTG
>chromosome02
GCTCTGAGCGAGATGCAACGCCGGCCGGCTTGGAGAGTAACTCAAGAGAGACAGAATGGA
AGATAGAGAACAAGAGAGTGAGAGGATAAGGATATAGACCAGACCACACAATTTTCTCTT
CTTTTTAACTTTGTATTAAGATCTTTTATGGAACATCTTTTATTGTTGATATCAAAATAA
CTGAAACTTATACTTTAATATTTTTTGAGACAAAAAGTAACAATCGTAAAAAAAAGTTCC
>chromosome03
ACGAGAGTTACCCCACCACCCATGTCTCGAGCCGACCAGATCTGCCGCCCACGACCCGAG
TCATCGTTGGATCCACCACCCACAACCCGCGACCGAGCTACGCCTCCTGTGGATTGATGC
CACTGCCCTGAGCTTCACTGCCGGTACTGTCGCTCGCGACCCGAGCTCCGCCGCTGGTAC
CGTCGCCCACAACTCAAGCTGTGTTGCCACTAGAGAAAAAGGAGGCGAGAGCGAGGGCAA

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Aiming at the file content above,I want to use pointer array to store it

Code:

---

    FILE *fp;
    fp = fopen("file1","r");
    char *pa[12];
    char *tmp;
    if(str[0] == '>')
        {
           
                  j = 0;
                  chr_num++;//chromosome count       
           
        }else{

            //format str  remove the last spaces
            sscanf(str,"%s",tmp);
           
            //combine sequcences
              while(*tmp++ != '\0')
              {
                    // i++;
                    *(pa[chr_num]+j++) = *tmp;
                         
              }
             
        }
       
    }
    fclose(fp);

---

data structure image:
http://202.127.18.228/s.jpg

Quote:

---

Originally Posted by zcrself

Code:

---

file:

>chromosome01
CTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAA
CCCTAAACCCTAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACCCTAAACAGCT
GACAGTACGATAGATCCACGCGAGAGGAACCGGAGAGACAACGGGATCCAGGCGCCAGCG
ACGGATCCGGGCGAGAGGGGAGTGGAGATCATGGATCCGTGCGGGAGGGGAAGAAGTCGC
CGAATCCGACCCTCCCATCGCCATCGACAGTAGGTCTGCGCGAGAGGGGCACCGGCGCTG
>chromosome02
GCTCTGAGCGAGATGCAACGCCGGCCGGCTTGGAGAGTAACTCAAGAGAGACAGAATGGA
AGATAGAGAACAAGAGAGTGAGAGGATAAGGATATAGACCAGACCACACAATTTTCTCTT
CTTTTTAACTTTGTATTAAGATCTTTTATGGAACATCTTTTATTGTTGATATCAAAATAA
CTGAAACTTATACTTTAATATTTTTTGAGACAAAAAGTAACAATCGTAAAAAAAAGTTCC
>chromosome03
ACGAGAGTTACCCCACCACCCATGTCTCGAGCCGACCAGATCTGCCGCCCACGACCCGAG
TCATCGTTGGATCCACCACCCACAACCCGCGACCGAGCTACGCCTCCTGTGGATTGATGC
CACTGCCCTGAGCTTCACTGCCGGTACTGTCGCTCGCGACCCGAGCTCCGCCGCTGGTAC
CGTCGCCCACAACTCAAGCTGTGTTGCCACTAGAGAAAAAGGAGGCGAGAGCGAGGGCAA

---

Aiming at the file content above,I want to use pointer array to store it

Code:

---

    FILE *fp;
    fp = fopen("file1","r");
    char *pa[12];
    char *tmp;
    if(str[0] == '>')
        {
           
                  j = 0;
                  chr_num++;//chromosome count       
           
        }else{

            //format str  remove the last spaces
            sscanf(str,"%s",tmp);
           
            //combine sequcences
              while(*tmp++ != '\0')
              {
                    // i++;
                    *(pa[chr_num]+j++) = *tmp;
                         
              }
             
        }
       
    }
    fclose(fp);

---

data structure image:
http://202.127.18.228/s.jpg

---

That code doesn't make much sense. Why don't you post a compilable program? Also, you need to allocate some memory to 'pa' - 12 pointers still == 0 available memory. Ditto for 'tmp'.

Quote:

---

Originally Posted by Sebastiani

That code doesn't make much sense. Why don't you post a compilable program? Also, you need to allocate some memory to 'pa' - 12 pointers still == 0 available memory. Ditto for 'tmp'.

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how to allocate some memory to 'pa'?
char *pa[12] = (char *) malloc( 10000000);

For a single pointer:

Code:

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char *p = malloc(n);

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For many:

Code:

---

char *pa[] =
{
      malloc(n),
      malloc(n),
      malloc(n),
      malloc(n),
      malloc(n)
};

---

All that could be done in a loop, of course. And don't forget to free() what you malloc(). Also, it might be a good idea to read up on pointers as much as possible at this point.

Quote:

---

Originally Posted by Sebastiani

For a single pointer:

Code:

---

char *p = malloc(n);

---

For many:

Code:

---

char *pa[] =
{
      malloc(n),
      malloc(n),
      malloc(n),
      malloc(n),
      malloc(n)
};

---

All that could be done in a loop, of course. And don't forget to free() what you malloc(). Also, it might be a good idea to read up on pointers as much as possible at this point.

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I see!

Using of pointer is very difficult!
Do you have some books about introduction of pointers of C or C++?