case C_MULT:
        ;
        fils0 = fork();
        if(fils0 == 0)
        {
            exit(compute(expr->left));
        }
        else
        {
            fils1 = fork();
            if(fils1 == 0)
            {
                exit(compute(expr->right));
            }
        }

        waitpid(fils0, &status, 0);
        if(WIFEXITED(status))
            sum = WEXITSTATUS(status);
        waitpid(fils1, &status, 0);
        if(WIFEXITED(status))
            sum *= WEXITSTATUS(status);
        return sum;