Thread: how do I dynamicly malloc memory ?

Input file as follws:

Code:

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCGCCGCCC
GGGGGGGGGGGGGAGGG?GGGG?GGGG?G?GGGAGG?A??GGGGGA
GGGGGGGGGGGGGGGGG?GGGG?GGGG?G?GGGGGG?G??GGAGGG
AAAAAAAAAAAAAAAACAAAAACAAAACCCAAAAAAAAAAAA?AAA
CCCCCCCCCCCCCCCCACCCCCACCCCAAACCCCCCCCCCCCCCCC
CACAACACAAAAACCCCCCACC?ACCACCCCACCCCCCCCACCACC
GAGAAGAGAAAAAGGGG?GAGG?AGGAGGGGAGGGGGGGGAGGAGG
GGAGGGGAGGGGGGAGGAAGGGGGGGGGGGGGGGGGGGGGGGGGGG
CCTCCCCTCCCCCCTCCTTCCCCCCCCCCCCCCCCCCCCCCCCCCC
GGAGGGGAGGGGGGAGG?AGGGGGGGGGGGGGGGGGGGG?GG?GGG
AACAAAACAAAAAACAACCAAAAAAAAA?ACAAA?AAAACAACACA
...

I want to load this file into char **inputfile;
how to malloc memory dynamicly?

My codes below can't malloc memory dynamicly

Code:

char **input = cmatrix(0,40,0,46);
char    **cmatrix(int nrl,int nrh,int ncl,int nch)
{
         int i, nrow=nrh-nrl+1,ncol=nch-ncl+1;
         char **cm;

         /* allocate pointers to rows        */
         if((cm=(char **)calloc(nrow,sizeof(char*)))==NULL)
         {
            printf("error cmatrix: calloc error No. 1 \n");
            return(NULL);
         }
         cm+=0;
         cm-=nrl;

         /* allocate rows and set pointers to them        */
         if((cm[nrl]=(char *)calloc(nrow*ncol,sizeof(char)))==NULL)
         {
            printf("error cmatrix: calloc error No. 2 \n");
            return(NULL);
         }
         cm[nrl]+=0;
         cm[nrl]-=nrl;

         for(i=nrl+1;i<=nrh;i++)
            cm[i]=cm[i-1]+ncol;
         /* return pointer to array of pointers to rows   */
         return cm;
}

So you want a 2d array. You need to do:

Code:

if((cm=(char **)calloc(nrow,sizeof(char*)))==NULL)
{
    printf("error cmatrix: calloc error No. 1 \n");
    return(NULL);
 }
for (i = 0; i < nrows; ++i) 
{
         if((cm[i]=(char *)calloc(ncol,sizeof(char)))==NULL)
         {
            printf("error cmatrix: calloc error No. 1 \n");
            return(NULL);
         }
}

You allocate nrow pointers to char. For each such pointer you allocate ncol char. Thus you have nrow*ncol char.