C: Globally define multidimensional char array -

what have is: read x strings s_1 ... s_x of defined max. length l=1000000 , store them. variable x given input , representation should globally defined.

how want is:

1. globally define pointer pointer char:

   char** s; 

2. locally, after reading x input, allocate space x pointers char:

   s = (char**) malloc(sizeof(char*)*x); 

3. locally allocating space each single string s_i , reading string allocated space:

   while(i<x){     s[i] = (char*) malloc(sizeof(char)*1000000);     scanf("%s",s[i]);     i++; } 

when try access

    s[0][0] 

it gives memory access error. ideas? thanks!

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edit:

i printed array , worked fine problem indeed in accessing code. here is: can see what's problem? because can't...

    makebinary(){          printf("inside makebinary()\n");          s_b = malloc(sizeof(int)*1000000*x);         length = malloc(sizeof(int)*x);         int i;         int j;         for(i=0;i<x;i++){             for(j=0;j<1000000;j++){ printf("1\n");                   if(s[i][j]=='\0'){  printf("2\n");                     length[i] = j;                          break;                                   }else{                       s_b[i][j] = s[i][j]-96;     printf("3\n");                       }                }         }            } 

it prints '1' crashes. know code far optimal solve problem first. thanks!

there lot of things going on:
changed strange casting malloc thing works icky.
shouldn't use sprintf copy memory... wouldn't allocate max.
can alloc correct amount, strlen()+1... make sure 0 pad end... like:

int t = 100; char * buffer = malloc(sizeof(char*)*t); s = &buffer;  for( int = 0; i<10 ; i++){     char * somestring = __file__;     size_t len = strlen(somestring);     s[i] = (char*) malloc(len+1);     s[i][len] = 0;     memcpy(s[i], somestring,len); }