Why do we need to cast what malloc returns?

Question

    int length = strlen(src);
    char *structSpace = malloc(sizeof(String) + length + 1);
    String *string = (String*) structSpace;    
    int *string = (int*) s         


        

Answer 1

The C FAQ list is an invaluable resource: Why does some code carefully cast the values returned by malloc to the pointer type being allocated?.