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    <p>You have to solve your problem in different steps,</p> <p>The first step is to check how many tokens you have in your input string to be able to allocate enough space to store an array of tokens.</p> <p>Then you should extract the tokens of the input strings in your tokens string array. To extract the tokens from your input string, you can use the <code>strtok</code> function from <code>&lt;string.h&gt;</code>.</p> <p>Finally you can use your tokens however you want, like converting them to <code>long</code> in your case.</p> <p>EDIT: given the requirements, here is a small implementation of what you could do. I don't check the returns of the malloc, you maybe should do it. </p> <pre><code>int main(int argc, char** argv) { int i; char* input_string = /* your input string for somewhere */; char** tokens; int tokens_count = 0; char* input_ptr = input_string; char* tmp_token; size_t tmp_token_length; // count the occurences of your separtor to have the number of elements for(; input_ptr[tokens_count]; input_ptr[tokens_count] == ',' ? tokens_count++ : input_ptr++); if(tokens_count == 0) { // no tokens found, what do you want to do here ? } else { // build our tokens array tokens = malloc(sizeof(*tokens) * tokens_count); i = 0; tmp_token = strtok(input_string, ','); while(tmp_token != NULL) { tmp_token_length = strlen(tmp_token); if(tmp_token_length != 0) { tokens[i] = malloc(tmp_token_length); strcpy(tokens[i], tmp_token); } else { tokens[i] = NULL; } i++; tmp_token = strtok(input_string, ','); } // populate your array of arrays of integers long** m = malloc(sizeof(long*) * tokens_count); for(i=0; i&lt;tokens_count; i++) { char* tmp_token = tokens[i]; if(tmp_token == NULL) { m[i] = NULL; } else { m[i] = malloc(sizeof(long)); m[i][0] = strtol(tmp_token, NULL, 10); } } } } </code></pre> <p>However, you should probably change your data structure by using structures instead of a massive array.</p>
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    1. POHow to separate an array and store it in a new array?
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    1. USnesderl
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    1. COWell I think you want to say "converting", "casting" string to integer is not possible. ;-)
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      1. USDon't You Worry Child
    2. CO`strtol`or `atoi`?
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    3. COYes these functions convert string to integer, casting is the term use to denote data type change done by using *cast* operator.
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      1. USDon't You Worry Child
 

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